Use CollectionViewTextItem instead of a cast

ios/chrome/browser/ui/settings/sync_settings_collection_view_controller.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/browser/ui/settings/sync_settings_collection_view_controller.h"
 
 #include <memory>
 
 #include "base/auto_reset.h"
 #include "base/mac/foundation_util.h"
@@ skipping 252 matching lines @@
 
   // Sync to Section.
   if ([self hasAccountsSection]) {
     NSMutableDictionary<NSString*, CollectionViewItem*>* mutableIdentityMap =
         [[[NSMutableDictionary alloc] init] autorelease];
     // Accounts section. Cells enabled if sync is on.
     [model addSectionWithIdentifier:SectionIdentifierSyncAccounts];
     CollectionViewTextItem* syncToHeader = [[[CollectionViewTextItem alloc]
         initWithType:ItemTypeHeader] autorelease];
     syncToHeader.text = l10n_util::GetNSString(IDS_IOS_SYNC_TO_TITLE);
+    syncToHeader.textColor = [[MDCPalette greyPalette] tint500];
     [model setHeader:syncToHeader
         forSectionWithIdentifier:SectionIdentifierSyncAccounts];
     ProfileOAuth2TokenService* oauth2_service =
         OAuth2TokenServiceFactory::GetForBrowserState(_browserState);
     AccountTrackerService* accountTracker =
         ios::AccountTrackerServiceFactory::GetForBrowserState(_browserState);
 
     for (const std::string& account_id : oauth2_service->GetAccounts()) {
       AccountInfo account = accountTracker->GetAccountInfo(account_id);
       ChromeIdentity* identity = ios::GetChromeBrowserProvider()
                                      ->GetChromeIdentityService()
                                      ->GetIdentityWithGaiaID(account.gaia);
       CollectionViewItem* accountItem = [self accountItem:identity];
       [model addItem:accountItem
           toSectionWithIdentifier:SectionIdentifierSyncAccounts];
       [mutableIdentityMap setObject:accountItem forKey:identity.gaiaID];
     }
     _identityMap.reset([mutableIdentityMap retain]);
   }
 
   // Data Types to sync. Enabled if sync is on.
   [model addSectionWithIdentifier:SectionIdentifierSyncServices];
   CollectionViewTextItem* syncServicesHeader = [
       [[CollectionViewTextItem alloc] initWithType:ItemTypeHeader] autorelease];
   syncServicesHeader.text =
       l10n_util::GetNSString(IDS_IOS_SYNC_DATA_TYPES_TITLE);
+  syncServicesHeader.textColor = [[MDCPalette greyPalette] tint500];
   [model setHeader:syncServicesHeader
       forSectionWithIdentifier:SectionIdentifierSyncServices];
   BOOL syncEverythingEnabled = _syncSetupService->IsSyncingAllDataTypes();
   [model addItem:[self syncEverythingSwitchItem:syncEverythingEnabled]
       toSectionWithIdentifier:SectionIdentifierSyncServices];
   // Specific Data Types to sync. Enabled if Sync Everything is off.
   for (int i = 0; i < SyncSetupService::kNumberOfSyncableDatatypes; ++i) {
     SyncSetupService::SyncableDatatype dataType =
         static_cast<SyncSetupService::SyncableDatatype>(i);
     [model addItem:[self switchItemForDataType:dataType]
@@ skipping 149 matching lines @@
                       forControlEvents:UIControlEventValueChanged];
       switchCell.switchView.tag = [self tagForIndexPath:indexPath];
       break;
     }
     default:
       break;
   }
   return cell;
 }
 
-// Method for overriding the header view of a section. Used to set the header
-// text color to gray.
-- (UICollectionReusableView*)collectionView:(UICollectionView*)collectionView
-          viewForSupplementaryElementOfKind:(NSString*)kind
-                                atIndexPath:(NSIndexPath*)indexPath {
-  UICollectionReusableView* view = [super collectionView:collectionView
-                       viewForSupplementaryElementOfKind:kind
-                                             atIndexPath:indexPath];
-
-  MDCCollectionViewTextCell* textCell =
-      base::mac::ObjCCast<MDCCollectionViewTextCell>(view);
-  if (textCell) {
-    textCell.textLabel.textColor = [[MDCPalette greyPalette] tint500];
-  }
-  return view;
-}
-
 #pragma mark UICollectionViewDelegate
 
 - (void)collectionView:(UICollectionView*)collectionView
     didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
 
   NSInteger itemType =
       [self.collectionViewModel itemTypeForIndexPath:indexPath];
   switch (itemType) {
     case ItemTypeSyncError:
@@ skipping 487 matching lines @@
   [self updateAccountItem:item withIdentity:identity];
   [self reconfigureCellsForItems:@[ item ]
          inSectionWithIdentifier:SectionIdentifierSyncAccounts];
 }
 
 - (void)onChromeIdentityServiceWillBeDestroyed {
   _identityServiceObserver.reset();
 }
 
 @end