NewMessageListView: Remove the flag.

This is the 2nd part of 3 CLs removing old MessageListView code.
The split is suggested in the review. https://crrev.com/c/1292667

(1) Removing the old implementation
(2) Removing the flag
(3) Renaming the implementation

TEST=trybot pass
BUG=870801

Change-Id: Id9b08072e9d9a35ca785552056b5056e0dc608e4
Reviewed-on: https://chromium-review.googlesource.com/c/1297769
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602593}

ash/public/cpp/ash_features.cc

@@ -35,9 +35,6 @@ const base::Feature kLockScreenHideSensitiveNotificationsSupport{
     "LockScreenHideSensitiveNotificationsSupport",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
-const base::Feature kNewMessageListView{"NewMessageListView",
-                                        base::FEATURE_ENABLED_BY_DEFAULT};
-
 const base::Feature kMediaSessionAccelerators{
     "MediaSessionAccelerators", base::FEATURE_DISABLED_BY_DEFAULT};
 
@@ -85,10 +82,6 @@ bool IsLockScreenHideSensitiveNotificationsSupported() {
       kLockScreenHideSensitiveNotificationsSupport);
 }
 
-bool IsNewMessageListViewEnabled() {
-  return base::FeatureList::IsEnabled(kNewMessageListView);
-}
-
 bool IsNightLightEnabled() {
   return base::FeatureList::IsEnabled(kNightLight);
 }

ash/public/cpp/ash_features.h

@@ -54,9 +54,6 @@ ASH_PUBLIC_EXPORT extern const base::Feature
 // TODO(beccahughes): Remove after launch. (https://crbug.com/894255)
 ASH_PUBLIC_EXPORT extern const base::Feature kMediaSessionAccelerators;
 
-// Enables new message list view. https://crbug.com/769219
-ASH_PUBLIC_EXPORT extern const base::Feature kNewMessageListView;
-
 // Enables the Night Light feature.
 ASH_PUBLIC_EXPORT extern const base::Feature kNightLight;
 
@@ -92,8 +89,6 @@ ASH_PUBLIC_EXPORT bool IsLockScreenInlineReplyEnabled();
 
 ASH_PUBLIC_EXPORT bool IsLockScreenHideSensitiveNotificationsSupported();
 
-ASH_PUBLIC_EXPORT bool IsNewMessageListViewEnabled();
-
 ASH_PUBLIC_EXPORT bool IsNightLightEnabled();
 
 ASH_PUBLIC_EXPORT bool IsNotificationScrollBarEnabled();

chrome/browser/about_flags.cc

@@ -1692,10 +1692,6 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kEnableNotificationScrollBarName,
      flag_descriptions::kEnableNotificationScrollBarDescription, kOsCrOS,
      FEATURE_VALUE_TYPE(ash::features::kNotificationScrollBar)},
-    {"ash-enable-new-message-list-view",
-     flag_descriptions::kEnableNewMessageListViewName,
-     flag_descriptions::kEnableNewMessageListViewDescription, kOsCrOS,
-     FEATURE_VALUE_TYPE(ash::features::kNewMessageListView)},
     {"allow-touchpad-three-finger-click",
      flag_descriptions::kAllowTouchpadThreeFingerClickName,
      flag_descriptions::kAllowTouchpadThreeFingerClickDescription, kOsCrOS,

chrome/browser/flag_descriptions.cc

@@ -670,10 +670,6 @@ const char kEnableNotificationScrollBarName[] =
 const char kEnableNotificationScrollBarDescription[] =
     "Enable the scroll bar of the notification list in Unified System Tray.";
 
-const char kEnableNewMessageListViewName[] = "Enable new message list view";
-const char kEnableNewMessageListViewDescription[] =
-    "Enable new implementation of message list view.";
-
 const char kEnableNupPrintingName[] = "Enable N-up printing";
 const char kEnableNupPrintingDescription[] =
     "Enable N-up printing in the print preview panel.";
@@ -1638,9 +1634,6 @@ const char kShelfHoverPreviewsDescription[] =
     "Shows previews of the open windows for a given running app when hovering "
     "over the shelf.";
 
-const char kShelfNewUiName[] = "Newest shelf redesign.";
-const char kShelfNewUiDescription[] = "Enables the newest shelf appearance.";
-
 const char kShowAndroidFilesInFilesAppName[] =
     "Show Android files in Files app";
 const char kShowAndroidFilesInFilesAppDescription[] =

chrome/browser/flag_descriptions.h

@@ -428,9 +428,6 @@ extern const char kEnableNightLightDescription[];
 extern const char kEnableNotificationScrollBarName[];
 extern const char kEnableNotificationScrollBarDescription[];
 
-extern const char kEnableNewMessageListViewName[];
-extern const char kEnableNewMessageListViewDescription[];
-
 extern const char kEnableNupPrintingName[];
 extern const char kEnableNupPrintingDescription[];
 
@@ -993,9 +990,6 @@ extern const char kSettingsWindowDescription[];
 extern const char kShelfHoverPreviewsName[];
 extern const char kShelfHoverPreviewsDescription[];
 
-extern const char kShelfNewUiName[];
-extern const char kShelfNewUiDescription[];
-
 extern const char kShowAndroidFilesInFilesAppName[];
 extern const char kShowAndroidFilesInFilesAppDescription[];