diff --git a/ios/chrome/browser/ui/settings/google_services/google_services_settings_coordinator.mm b/ios/chrome/browser/ui/settings/google_services/google_services_settings_coordinator.mm
index 95452a0c750c8c..1b0b5613a9a0c0 100644
--- a/ios/chrome/browser/ui/settings/google_services/google_services_settings_coordinator.mm
+++ b/ios/chrome/browser/ui/settings/google_services/google_services_settings_coordinator.mm
@@ -205,7 +205,7 @@ - (void)openReauthDialogAsSyncIsInAuthError {
 - (void)openPassphraseDialog {
   SyncEncryptionPassphraseTableViewController* controller =
       [[SyncEncryptionPassphraseTableViewController alloc]
-          initWithBrowserState:self.browser->GetBrowserState()];
+          initWithBrowser:self.browser];
   // TODO(crbug.com/1045047): Use HandlerForProtocol after commands protocol
   // clean up.
   controller.dispatcher = static_cast<
diff --git a/ios/chrome/browser/ui/settings/google_services/manage_sync_settings_coordinator.mm b/ios/chrome/browser/ui/settings/google_services/manage_sync_settings_coordinator.mm
index 860d7f303a4f74..575b8e35df90bd 100644
--- a/ios/chrome/browser/ui/settings/google_services/manage_sync_settings_coordinator.mm
+++ b/ios/chrome/browser/ui/settings/google_services/manage_sync_settings_coordinator.mm
@@ -144,10 +144,10 @@ - (void)openPassphraseDialog {
   // Otherwise, show the full encryption options.
   if (self.syncService->GetUserSettings()->IsPassphraseRequired()) {
     controllerToPush = [[SyncEncryptionPassphraseTableViewController alloc]
-        initWithBrowserState:self.browser->GetBrowserState()];
+        initWithBrowser:self.browser];
   } else {
     controllerToPush = [[SyncEncryptionTableViewController alloc]
-        initWithBrowserState:self.browser->GetBrowserState()];
+        initWithBrowser:self.browser];
   }
   // TODO(crbug.com/1045047): Use HandlerForProtocol after commands protocol
   // clean up.
diff --git a/ios/chrome/browser/ui/settings/settings_navigation_controller.mm b/ios/chrome/browser/ui/settings/settings_navigation_controller.mm
index 12e1b26db88152..b88529fcfc7171 100644
--- a/ios/chrome/browser/ui/settings/settings_navigation_controller.mm
+++ b/ios/chrome/browser/ui/settings/settings_navigation_controller.mm
@@ -127,7 +127,7 @@ @implementation SettingsNavigationController
   DCHECK(browser);
   SyncEncryptionPassphraseTableViewController* controller =
       [[SyncEncryptionPassphraseTableViewController alloc]
-          initWithBrowserState:browser->GetBrowserState()];
+          initWithBrowser:browser];
   controller.dispatcher = [delegate handlerForSettings];
   SettingsNavigationController* nc = [[SettingsNavigationController alloc]
       initWithRootViewController:controller
@@ -513,7 +513,7 @@ - (void)showSyncPassphraseSettingsFromViewController:
     (UIViewController*)baseViewController {
   SyncEncryptionPassphraseTableViewController* controller =
       [[SyncEncryptionPassphraseTableViewController alloc]
-          initWithBrowserState:self.browser->GetBrowserState()];
+          initWithBrowser:self.browser];
   controller.dispatcher = [self.settingsNavigationDelegate handlerForSettings];
   [self pushViewController:controller animated:YES];
 }
diff --git a/ios/chrome/browser/ui/settings/sync/BUILD.gn b/ios/chrome/browser/ui/settings/sync/BUILD.gn
index a573d2acc30fe3..f832148d732b72 100644
--- a/ios/chrome/browser/ui/settings/sync/BUILD.gn
+++ b/ios/chrome/browser/ui/settings/sync/BUILD.gn
@@ -26,6 +26,7 @@ source_set("sync") {
     "//ios/chrome/browser",
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
+    "//ios/chrome/browser/main:public",
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/sync",
     "//ios/chrome/browser/ui:feature_flags",
@@ -74,6 +75,7 @@ source_set("unit_tests") {
     "//ios/chrome/browser",
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state:test_support",
+    "//ios/chrome/browser/main:test_support",
     "//ios/chrome/browser/prefs",
     "//ios/chrome/browser/prefs:browser_prefs",
     "//ios/chrome/browser/sync",
diff --git a/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller.mm b/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller.mm
index 3ee69f18b2962a..e4d2a88a9941ed 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller.mm
+++ b/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller.mm
@@ -30,8 +30,8 @@ - (TableViewItem*)confirmPassphraseItem;
 
 @implementation SyncCreatePassphraseTableViewController
 
-- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState {
-  self = [super initWithBrowserState:browserState];
+- (instancetype)initWithBrowser:(Browser*)browser {
+  self = [super initWithBrowser:browser];
   if (self) {
     self.title =
         l10n_util::GetNSString(IDS_IOS_SYNC_ENCRYPTION_CREATE_PASSPHRASE);
diff --git a/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller_unittest.mm b/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller_unittest.mm
index 73c07c5b1804f7..f76597cb137d6f 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller_unittest.mm
+++ b/ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller_unittest.mm
@@ -44,7 +44,7 @@ void TearDown() override {
 
   ChromeTableViewController* InstantiateController() override {
     return [[SyncCreatePassphraseTableViewController alloc]
-        initWithBrowserState:chrome_browser_state_.get()];
+        initWithBrowser:browser_.get()];
   }
 
   SyncCreatePassphraseTableViewController* SyncController() {
diff --git a/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.h b/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.h
index 401f2d02a908c4..cf6271cc6cba03 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.h
+++ b/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.h
@@ -10,7 +10,7 @@
 #import "ios/chrome/browser/sync/sync_observer_bridge.h"
 #import "ios/chrome/browser/ui/settings/settings_root_table_view_controller.h"
 
-class ChromeBrowserState;
+class Browser;
 
 namespace sync_encryption_passphrase {
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
@@ -36,8 +36,7 @@ typedef NS_ENUM(NSInteger, ItemType) {
 @property(nonatomic, copy) NSString* syncErrorMessage;
 
 // |browserState| must not be nil.
-- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState
-    NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithBrowser:(Browser*)browser NS_DESIGNATED_INITIALIZER;
 - (instancetype)initWithStyle:(UITableViewStyle)style NS_UNAVAILABLE;
 
 @end
diff --git a/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.mm b/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.mm
index 9cacdbb5cdd9c4..ddb4538daf9a51 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.mm
+++ b/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller.mm
@@ -19,6 +19,7 @@
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
+#import "ios/chrome/browser/main/browser.h"
 #import "ios/chrome/browser/signin/authentication_service.h"
 #include "ios/chrome/browser/signin/authentication_service_factory.h"
 #include "ios/chrome/browser/signin/identity_manager_factory.h"
@@ -60,7 +61,6 @@
 @interface SyncEncryptionPassphraseTableViewController () <
     IdentityManagerObserverBridgeDelegate,
     SettingsControllerProtocol> {
-  ChromeBrowserState* _browserState;
   // Whether the decryption progress is currently being shown.
   BOOL _isDecryptionProgressShown;
   NSString* _savedTitle;
@@ -71,26 +71,31 @@ @interface SyncEncryptionPassphraseTableViewController () <
   UITextField* _passphrase;
 }
 
+@property(nonatomic, assign, readonly) Browser* browser;
+
 @end
 
 @implementation SyncEncryptionPassphraseTableViewController
 
-- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState {
-  DCHECK(browserState);
+@synthesize browser = _browser;
+
+- (instancetype)initWithBrowser:(Browser*)browser {
+  DCHECK(browser);
   UITableViewStyle style = base::FeatureList::IsEnabled(kSettingsRefresh)
                                ? UITableViewStylePlain
                                : UITableViewStyleGrouped;
   self = [super initWithStyle:style];
   if (self) {
+    _browser = browser;
+    ChromeBrowserState* browserState = self.browser->GetBrowserState();
     self.title = l10n_util::GetNSString(IDS_IOS_SYNC_ENTER_PASSPHRASE_TITLE);
     self.shouldHideDoneButton = YES;
-    _browserState = browserState;
     NSString* userEmail =
-        [AuthenticationServiceFactory::GetForBrowserState(_browserState)
+        [AuthenticationServiceFactory::GetForBrowserState(browserState)
                 ->GetAuthenticatedIdentity() userEmail];
     DCHECK(userEmail);
     syncer::SyncService* service =
-        ProfileSyncServiceFactory::GetForBrowserState(_browserState);
+        ProfileSyncServiceFactory::GetForBrowserState(browserState);
     if (service->IsEngineInitialized() &&
         service->GetUserSettings()->IsUsingSecondaryPassphrase()) {
       base::Time passphrase_time =
@@ -115,7 +120,7 @@ - (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState {
 
     _identityManagerObserver =
         std::make_unique<signin::IdentityManagerObserverBridge>(
-            IdentityManagerFactory::GetForBrowserState(_browserState), self);
+            IdentityManagerFactory::GetForBrowserState(browserState), self);
   }
   return self;
 }
@@ -127,8 +132,9 @@ - (UITextField*)passphrase {
 - (NSString*)syncErrorMessage {
   if (_syncErrorMessage)
     return _syncErrorMessage;
+  ChromeBrowserState* browserState = self.browser->GetBrowserState();
   SyncSetupService* service =
-      SyncSetupServiceFactory::GetForBrowserState(_browserState);
+      SyncSetupServiceFactory::GetForBrowserState(browserState);
   DCHECK(service);
   SyncSetupService::SyncServiceState syncServiceState =
       service->GetSyncServiceState();
@@ -137,7 +143,7 @@ - (NSString*)syncErrorMessage {
   if (syncServiceState == SyncSetupService::kSyncServiceNeedsPassphrase)
     return nil;
 
-  return GetSyncErrorMessageForBrowserState(_browserState);
+  return GetSyncErrorMessageForBrowserState(browserState);
 }
 
 #pragma mark - View lifecycle
@@ -279,17 +285,18 @@ - (BOOL)forDecryption {
 
 - (void)signInPressed {
   DCHECK([_passphrase text].length);
+  ChromeBrowserState* browserState = self.browser->GetBrowserState();
 
   if (!_syncObserver.get()) {
     _syncObserver.reset(new SyncObserverBridge(
-        self, ProfileSyncServiceFactory::GetForBrowserState(_browserState)));
+        self, ProfileSyncServiceFactory::GetForBrowserState(browserState)));
   }
 
   // Clear out the error message.
   self.syncErrorMessage = nil;
 
   syncer::SyncService* service =
-      ProfileSyncServiceFactory::GetForBrowserState(_browserState);
+      ProfileSyncServiceFactory::GetForBrowserState(browserState);
   DCHECK(service);
   // It is possible for a race condition to happen where a user is allowed
   // to call the backend with the passphrase before the backend is
@@ -468,8 +475,9 @@ - (void)textFieldDidEndEditing:(id)sender {
 #pragma mark - SyncObserverModelBridge
 
 - (void)onSyncStateChanged {
+  ChromeBrowserState* browserState = self.browser->GetBrowserState();
   syncer::SyncService* service =
-      ProfileSyncServiceFactory::GetForBrowserState(_browserState);
+      ProfileSyncServiceFactory::GetForBrowserState(browserState);
 
   if (!service->IsEngineInitialized()) {
     return;
@@ -498,7 +506,8 @@ - (void)onSyncStateChanged {
 #pragma mark - IdentityManagerObserverBridgeDelegate
 
 - (void)onEndBatchOfRefreshTokenStateChanges {
-  if (AuthenticationServiceFactory::GetForBrowserState(_browserState)
+  ChromeBrowserState* browserState = self.browser->GetBrowserState();
+  if (AuthenticationServiceFactory::GetForBrowserState(browserState)
           ->IsAuthenticated()) {
     return;
   }
diff --git a/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller_unittest.mm b/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller_unittest.mm
index f4b441d5a72e1d..0c40cbb4b14880 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller_unittest.mm
+++ b/ios/chrome/browser/ui/settings/sync/sync_encryption_passphrase_table_view_controller_unittest.mm
@@ -88,7 +88,7 @@ void TearDown() override {
 
   ChromeTableViewController* InstantiateController() override {
     return [[SyncEncryptionPassphraseTableViewController alloc]
-        initWithBrowserState:chrome_browser_state_.get()];
+        initWithBrowser:browser_.get()];
   }
 
   SyncEncryptionPassphraseTableViewController* SyncController() {
diff --git a/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.h b/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.h
index 6959dfee045bc2..eda2df2bfde140 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.h
+++ b/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.h
@@ -7,14 +7,13 @@
 
 #import "ios/chrome/browser/ui/settings/settings_root_table_view_controller.h"
 
-class ChromeBrowserState;
+class Browser;
 
 // Controller to allow user to specify encryption passphrase for Sync.
 @interface SyncEncryptionTableViewController : SettingsRootTableViewController
 
 // Designated initializer. |browserState| must not be nil.
-- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState
-    NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithBrowser:(Browser*)browser NS_DESIGNATED_INITIALIZER;
 - (instancetype)initWithStyle:(UITableViewStyle)style NS_UNAVAILABLE;
 
 @end
diff --git a/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.mm b/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.mm
index 7a932b301a1912..22c45ddfd177bb 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.mm
+++ b/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller.mm
@@ -17,6 +17,7 @@
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
+#import "ios/chrome/browser/main/browser.h"
 #include "ios/chrome/browser/sync/profile_sync_service_factory.h"
 #import "ios/chrome/browser/sync/sync_observer_bridge.h"
 #import "ios/chrome/browser/ui/settings/sync/sync_create_passphrase_table_view_controller.h"
@@ -53,25 +54,30 @@ typedef NS_ENUM(NSInteger, ItemType) {
 }  // namespace
 
 @interface SyncEncryptionTableViewController () <SyncObserverModelBridge> {
-  ChromeBrowserState* _browserState;
   std::unique_ptr<SyncObserverBridge> _syncObserver;
   BOOL _isUsingSecondaryPassphrase;
 }
+
+@property(nonatomic, assign, readonly) Browser* browser;
+
 @end
 
 @implementation SyncEncryptionTableViewController
 
-- (instancetype)initWithBrowserState:(ChromeBrowserState*)browserState {
-  DCHECK(browserState);
+@synthesize browser = _browser;
+
+- (instancetype)initWithBrowser:(Browser*)browser {
+  DCHECK(browser);
   UITableViewStyle style = base::FeatureList::IsEnabled(kSettingsRefresh)
                                ? UITableViewStylePlain
                                : UITableViewStyleGrouped;
   self = [super initWithStyle:style];
   if (self) {
+    _browser = browser;
+    ChromeBrowserState* browserState = self.browser->GetBrowserState();
     self.title = l10n_util::GetNSString(IDS_IOS_SYNC_ENCRYPTION_TITLE);
-    _browserState = browserState;
     syncer::SyncService* syncService =
-        ProfileSyncServiceFactory::GetForBrowserState(_browserState);
+        ProfileSyncServiceFactory::GetForBrowserState(browserState);
     _isUsingSecondaryPassphrase =
         syncService->IsEngineInitialized() &&
         syncService->GetUserSettings()->IsUsingSecondaryPassphrase();
@@ -165,13 +171,14 @@ - (void)tableView:(UITableView*)tableView
   switch (item.type) {
     case ItemTypePassphrase: {
       DCHECK(switches::IsSyncAllowedByFlag());
+      ChromeBrowserState* browserState = self.browser->GetBrowserState();
       syncer::SyncService* service =
-          ProfileSyncServiceFactory::GetForBrowserState(_browserState);
+          ProfileSyncServiceFactory::GetForBrowserState(browserState);
       if (service->IsEngineInitialized() &&
           !service->GetUserSettings()->IsUsingSecondaryPassphrase()) {
         SyncCreatePassphraseTableViewController* controller =
             [[SyncCreatePassphraseTableViewController alloc]
-                initWithBrowserState:_browserState];
+                initWithBrowser:self.browser];
         if (controller) {
           controller.dispatcher = self.dispatcher;
           [self.navigationController pushViewController:controller
@@ -192,8 +199,9 @@ - (void)tableView:(UITableView*)tableView
 #pragma mark SyncObserverModelBridge
 
 - (void)onSyncStateChanged {
+  ChromeBrowserState* browserState = self.browser->GetBrowserState();
   syncer::SyncService* service =
-      ProfileSyncServiceFactory::GetForBrowserState(_browserState);
+      ProfileSyncServiceFactory::GetForBrowserState(browserState);
   BOOL isNowUsingSecondaryPassphrase =
       service->IsEngineInitialized() &&
       service->GetUserSettings()->IsUsingSecondaryPassphrase();
diff --git a/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller_unittest.mm b/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller_unittest.mm
index de23d4beb2f41d..0f78711aa5fa77 100644
--- a/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller_unittest.mm
+++ b/ios/chrome/browser/ui/settings/sync/sync_encryption_table_view_controller_unittest.mm
@@ -11,6 +11,7 @@
 #include "components/strings/grit/components_strings.h"
 #include "components/sync/driver/test_sync_service.h"
 #include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
+#import "ios/chrome/browser/main/test_browser.h"
 #include "ios/chrome/browser/sync/profile_sync_service_factory.h"
 #import "ios/chrome/browser/ui/table_view/cells/table_view_text_item.h"
 #import "ios/chrome/browser/ui/table_view/chrome_table_view_controller_test.h"
@@ -39,13 +40,13 @@ void SetUp() override {
     test_cbs_builder.AddTestingFactory(
         ProfileSyncServiceFactory::GetInstance(),
         base::BindRepeating(&CreateTestSyncService));
-    chrome_browser_state_ = test_cbs_builder.Build();
+    browser_ = std::make_unique<TestBrowser>();
     ChromeTableViewControllerTest::SetUp();
 
+    ChromeBrowserState* browserState = browser_.get()->GetBrowserState();
     syncer::TestSyncService* test_sync_service =
         static_cast<syncer::TestSyncService*>(
-            ProfileSyncServiceFactory::GetForBrowserState(
-                chrome_browser_state_.get()));
+            ProfileSyncServiceFactory::GetForBrowserState(browserState));
     test_sync_service->SetIsUsingSecondaryPassphrase(true);
 
     CreateController();
@@ -53,11 +54,11 @@ void SetUp() override {
 
   ChromeTableViewController* InstantiateController() override {
     return [[SyncEncryptionTableViewController alloc]
-        initWithBrowserState:chrome_browser_state_.get()];
+        initWithBrowser:browser_.get()];
   }
 
   web::WebTaskEnvironment task_environment_;
-  std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
+  std::unique_ptr<Browser> browser_;
 };
 
 TEST_F(SyncEncryptionTableViewControllerTest, TestModel) {