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

chrome/browser/extensions/extension_toolbar_model_factory.h

 // Copyright 2013 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_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_FACTORY_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_FACTORY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class Profile;
 
 namespace extensions {
 
 class ExtensionToolbarModel;
 
 class ExtensionToolbarModelFactory : public BrowserContextKeyedServiceFactory {
  public:
   static ExtensionToolbarModel* GetForProfile(Profile* profile);
 
   static ExtensionToolbarModelFactory* GetInstance();
 
  private:
   friend struct DefaultSingletonTraits<ExtensionToolbarModelFactory>;
 
   ExtensionToolbarModelFactory();
-  virtual ~ExtensionToolbarModelFactory();
+  ~ExtensionToolbarModelFactory() override;
 
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
-  virtual bool ServiceIsCreatedWithBrowserContext() const override;
-  virtual bool ServiceIsNULLWhileTesting() const override;
+  bool ServiceIsCreatedWithBrowserContext() const override;
+  bool ServiceIsNULLWhileTesting() const override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLBAR_MODEL_FACTORY_H_