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

chrome/browser/services/gcm/push_messaging_permission_context_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_SERVICES_GCM_PUSH_MESSAGING_PERMISSION_CONTEXT_FACTORY_H_
 #define CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_PERMISSION_CONTEXT_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class Profile;
 
 namespace gcm {
 
 class PushMessagingPermissionContext;
 
 class PushMessagingPermissionContextFactory
     : public BrowserContextKeyedServiceFactory {
  public:
   static PushMessagingPermissionContext* GetForProfile(Profile* profile);
   static PushMessagingPermissionContextFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<PushMessagingPermissionContextFactory>;
 
   PushMessagingPermissionContextFactory();
-  virtual ~PushMessagingPermissionContextFactory();
+  ~PushMessagingPermissionContextFactory() override;
 
   // BrowserContextKeyedBaseFactory methods:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(PushMessagingPermissionContextFactory);
 };
 
 }  // namespace gcm
 #endif  // CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_PERMISSION_CONTEXT_FACTORY_H_