Smart Lock: Remove whitelist for sign-in enabled pref.

This is no longer accessed from JS/HTML.

R=hansberry@chromium.org, reillyg@chromium.org

Bug: 894585
Test: none
Change-Id: Ibfde36a2c8f5c0e2c1853d85ca30d2f8f59121da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1932169
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718786}

chrome/browser/extensions/api/settings_private/prefs_util.cc

@@ -16,7 +16,6 @@
 #include "chrome/browser/prefs/session_startup_pref.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
-#include "chromeos/components/proximity_auth/proximity_auth_pref_names.h"
 #include "components/autofill/core/common/autofill_prefs.h"
 #include "components/bookmarks/common/bookmark_pref_names.h"
 #include "components/browsing_data/core/pref_names.h"
@@ -356,13 +355,6 @@ const PrefsUtil::TypedPrefMap& PrefsUtil::GetWhitelistedKeys() {
   (*s_whitelist)[ash::prefs::kMessageCenterLockScreenMode] =
       settings_api::PrefType::PREF_TYPE_STRING;
 
-  // TODO(crbug.com/894585): After M71, only whitelist the Smart Lock 'sign-in
-  // enabled' pref in the pre-Multidevice case, i.e., when
-  // kEnableUnifiedMultiDeviceSettings is false. In the Multidevice case, JS
-  // access to this pref is restricted.
-  (*s_whitelist)[proximity_auth::prefs::kProximityAuthIsChromeOSLoginEnabled] =
-      settings_api::PrefType::PREF_TYPE_BOOLEAN;
-
   // Accessibility.
   (*s_whitelist)[ash::prefs::kAccessibilitySpokenFeedbackEnabled] =
       settings_api::PrefType::PREF_TYPE_BOOLEAN;

chrome/browser/resources/settings/multidevice_page/multidevice_smartlock_subpage.js

@@ -19,12 +19,8 @@ cr.define('settings', function() {
     DISABLED: 'disabled',
   };
 
-  /** @const {string} */
-  SmartLockSignInEnabledPrefName = 'proximity_auth.is_chromeos_login_enabled';
-
   return {
     SignInEnabledState: SignInEnabledState,
-        SmartLockSignInEnabledPrefName: SmartLockSignInEnabledPrefName,
   };
 });