[ObjC ARC] Converts ios/public/provider/chrome/browser/images:images to ARC.

ios/public/provider/chrome/browser/images/branded_image_provider.mm

 // Copyright 2016 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/public/provider/chrome/browser/images/branded_image_provider.h"
 
 #import <Foundation/Foundation.h>
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 BrandedImageProvider::BrandedImageProvider() {}
 
 BrandedImageProvider::~BrandedImageProvider() {}
 
 UIImage* BrandedImageProvider::GetAccountsListActivityControlsImage() {
   return nil;
 }
 
 UIImage* BrandedImageProvider::GetClearBrowsingDataAccountActivityImage() {
   return nil;
@@ skipping 15 matching lines @@
   return nil;
 }
 
 bool BrandedImageProvider::GetToolbarVoiceSearchButtonImageId(int* image_id) {
   return false;
 }
 
 UIImage* BrandedImageProvider::GetWhatsNewIconImage(WhatsNewIcon type) {
   return nil;
 }