Use CollectionViewTextItem instead of a cast

ios/chrome/browser/ui/settings/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/settings_collection_view_controller.h"
 
 #include <memory>
 
 #import "base/ios/weak_nsobject.h"
 #import "base/mac/foundation_util.h"
@@ skipping 314 matching lines @@
   } else {
     [model addItem:[self accountCellItem]
         toSectionWithIdentifier:SectionIdentifierSignIn];
   }
 
   // Basics section
   [model addSectionWithIdentifier:SectionIdentifierBasics];
   CollectionViewTextItem* basicsHeader = [
       [[CollectionViewTextItem alloc] initWithType:ItemTypeHeader] autorelease];
   basicsHeader.text = l10n_util::GetNSString(IDS_IOS_OPTIONS_GENERAL_TAB_LABEL);
+  basicsHeader.textColor = [[MDCPalette greyPalette] tint500];
   [model setHeader:basicsHeader
       forSectionWithIdentifier:SectionIdentifierBasics];
   [model addItem:[self searchEngineDetailItem]
       toSectionWithIdentifier:SectionIdentifierBasics];
   [model addItem:[self savePasswordsDetailItem]
       toSectionWithIdentifier:SectionIdentifierBasics];
   [model addItem:[self autoFillDetailItem]
       toSectionWithIdentifier:SectionIdentifierBasics];
   [model addItem:[self nativeAppsDetailItem]
       toSectionWithIdentifier:SectionIdentifierBasics];
 
   // Advanced Section
   [model addSectionWithIdentifier:SectionIdentifierAdvanced];
   CollectionViewTextItem* advancedHeader = [
       [[CollectionViewTextItem alloc] initWithType:ItemTypeHeader] autorelease];
   advancedHeader.text =
       l10n_util::GetNSString(IDS_IOS_OPTIONS_ADVANCED_TAB_LABEL);
+  advancedHeader.textColor = [[MDCPalette greyPalette] tint500];
   [model setHeader:advancedHeader
       forSectionWithIdentifier:SectionIdentifierAdvanced];
   [model addItem:[self voiceSearchDetailItem]
       toSectionWithIdentifier:SectionIdentifierAdvanced];
   [model addItem:[self privacyDetailItem]
       toSectionWithIdentifier:SectionIdentifierAdvanced];
   [model addItem:[self contentSettingsDetailItem]
       toSectionWithIdentifier:SectionIdentifierAdvanced];
   [model addItem:[self bandwidthManagementDetailItem]
       toSectionWithIdentifier:SectionIdentifierAdvanced];
 
   // Info Section
   [model addSectionWithIdentifier:SectionIdentifierInfo];
   [model addItem:[self aboutChromeDetailItem]
       toSectionWithIdentifier:SectionIdentifierInfo];
 
   // Debug Section
   if ([self hasDebugSection]) {
     [model addSectionWithIdentifier:SectionIdentifierDebug];
     CollectionViewTextItem* debugHeader = [[[CollectionViewTextItem alloc]
         initWithType:ItemTypeHeader] autorelease];
     debugHeader.text = @"Debug";
+    debugHeader.textColor = [[MDCPalette greyPalette] tint500];
     [model setHeader:debugHeader
         forSectionWithIdentifier:SectionIdentifierDebug];
   }
 
   if (experimental_flags::IsMemoryDebuggingEnabled()) {
     _showMemoryDebugToolsItem.reset([[self showMemoryDebugSwitchItem] retain]);
     [model addItem:_showMemoryDebugToolsItem
         toSectionWithIdentifier:SectionIdentifierDebug];
   }
 
@@ skipping 290 matching lines @@
 #endif  // CHROMIUM_BUILD && !defined(NDEBUG)
       break;
     }
     default:
       break;
   }
 
   return cell;
 }
 
-- (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];
 
   id object = [self.collectionViewModel itemAtIndexPath:indexPath];
   if ([object respondsToSelector:@selector(isEnabled)] &&
       ![object performSelector:@selector(isEnabled)]) {
     // Don't perform any action if the cell isn't enabled.
@@ skipping 382 matching lines @@
     NSString* autofillDetail =
         autofillEnabled ? l10n_util::GetNSString(IDS_IOS_SETTING_ON)
                         : l10n_util::GetNSString(IDS_IOS_SETTING_OFF);
     _autoFillDetailItem.get().detailText = autofillDetail;
     [self reconfigureCellsForItems:@[ _autoFillDetailItem ]
            inSectionWithIdentifier:SectionIdentifierBasics];
   }
 }
 
 @end