[iOS] Remove references to flag kClearSyncedData.

Feature ClearSyncedData has been enabled by default. Clean up code.

Bug: 1005509
Change-Id: I8eaea684e754afda13bcde2134e4fa5e2434c9ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260193
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781276}

ios/chrome/browser/ui/settings/google_services/accounts_table_view_controller.mm

@@ -234,7 +234,6 @@ typedef NS_ENUM(NSInteger, ItemType) {
       toSectionWithIdentifier:SectionIdentifierAccounts];
 
   // Sign out section.
-  if (base::FeatureList::IsEnabled(kClearSyncedData)) {
   [model addSectionWithIdentifier:SectionIdentifierSignOut];
   // Adds a signout option if the account is not managed.
   if (![self authService]->IsAuthenticatedIdentityManaged()) {
@@ -254,11 +253,6 @@ typedef NS_ENUM(NSInteger, ItemType) {
     [model setFooter:[self signOutNonManagedAccountFooterItem]
         forSectionWithIdentifier:SectionIdentifierSignOut];
   }
-  } else {
-    [model addSectionWithIdentifier:SectionIdentifierSignOut];
-    [model addItem:[self signOutItem]
-        toSectionWithIdentifier:SectionIdentifierSignOut];
-  }
 }
 
 #pragma mark - Model objects
@@ -370,13 +364,9 @@ typedef NS_ENUM(NSInteger, ItemType) {
       break;
     }
     case ItemTypeSignOut: {
-      if (base::FeatureList::IsEnabled(kClearSyncedData)) {
       UIView* itemView =
           [[tableView cellForRowAtIndexPath:indexPath] contentView];
       [self showSignOutWithClearData:NO itemView:itemView];
-      } else {
-        [self showSignOut];
-      }
       break;
     }
     case ItemTypeSignOutAndClearData: {
@@ -598,10 +588,9 @@ typedef NS_ENUM(NSInteger, ItemType) {
               self.navigationController)
               popViewControllerOrCloseSettingsAnimated:YES];
         });
-    // Get UMA metrics on the usage of the new UI, which is only available for
-    // users in the experiement with non-managed accounts.
-    if (base::FeatureList::IsEnabled(kClearSyncedData) &&
-        ![self authService]->IsAuthenticatedIdentityManaged()) {
+    // Get UMA metrics on the usage of different options for signout available
+    // for users with non-managed accounts.
+    if (![self authService]->IsAuthenticatedIdentityManaged()) {
       UMA_HISTOGRAM_BOOLEAN("Signin.UserRequestedWipeDataOnSignout",
                             forceClearData);
     }