Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/enhanced_bookmarks/chrome_bookmark_server_cluster_service_factory.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_ENHANCED_BOOKMARKS_CHROME_BOOKMARK_SERVER_CLUSTER_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_ENHANCED_BOOKMARKS_CHROME_BOOKMARK_SERVER_CLUSTER_SERVICE_FACTORY_H_
 
 #include "base/macros.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
@@ skipping 10 matching lines @@
  public:
   static ChromeBookmarkServerClusterServiceFactory* GetInstance();
   static ChromeBookmarkServerClusterService* GetForBrowserContext(
       content::BrowserContext* context);
 
  private:
   friend struct DefaultSingletonTraits<
       ChromeBookmarkServerClusterServiceFactory>;
 
   ChromeBookmarkServerClusterServiceFactory();
-  virtual ~ChromeBookmarkServerClusterServiceFactory() {}
+  ~ChromeBookmarkServerClusterServiceFactory() override {}
 
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBookmarkServerClusterServiceFactory);
 };
 
 }  // namespace enhanced_bookmarks
 
 #endif  // CHROME_BROWSER_ENHANCED_BOOKMARKS_CHROME_BOOKMARK_SERVER_CLUSTER_SERVICE_FACTORY_H_