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

chrome/browser/favicon/chrome_favicon_client_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_FAVICON_CHROME_FAVICON_CLIENT_FACTORY_H_
 #define CHROME_BROWSER_FAVICON_CHROME_FAVICON_CLIENT_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/favicon/chrome_favicon_client.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class Profile;
 
 // Singleton that owns all ChromeFaviconClients and associates them with
 // Profiles.
 class ChromeFaviconClientFactory : public BrowserContextKeyedServiceFactory {
  public:
   // Returns the instance of FaviconClient associated with this profile
   // (creating one if none exists).
   static FaviconClient* GetForProfile(Profile* profile);
 
   // Returns an instance of the factory singleton.
   static ChromeFaviconClientFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<ChromeFaviconClientFactory>;
 
   ChromeFaviconClientFactory();
-  virtual ~ChromeFaviconClientFactory();
+  ~ChromeFaviconClientFactory() override;
 
   // BrowserContextKeyedServiceFactory:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 };
 
 #endif  // CHROME_BROWSER_FAVICON_CHROME_FAVICON_CLIENT_FACTORY_H_