Update {virtual,override} to follow C++11 style in extensions.

extensions/browser/browser_context_keyed_api_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 EXTENSIONS_BROWSER_BROWSER_CONTEXT_KEYED_API_FACTORY_H_
 #define EXTENSIONS_BROWSER_BROWSER_CONTEXT_KEYED_API_FACTORY_H_
 
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 #include "components/keyed_service/core/keyed_service.h"
@@ skipping 80 matching lines @@
     DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   }
 
   BrowserContextKeyedAPIFactory()
       : BrowserContextKeyedServiceFactory(
             T::service_name(),
             BrowserContextDependencyManager::GetInstance()) {
     DeclareFactoryDependencies();
   }
 
-  virtual ~BrowserContextKeyedAPIFactory() {}
+  ~BrowserContextKeyedAPIFactory() override {}
 
  private:
   // BrowserContextKeyedServiceFactory implementation.
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override {
     return new T(context);
   }
 
   // BrowserContextKeyedBaseFactory implementation.
   // These can be effectively overridden with template specializations.
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override {
     if (T::kServiceRedirectedInIncognito)
       return ExtensionsBrowserClient::Get()->GetOriginalContext(context);
 
     if (T::kServiceHasOwnInstanceInIncognito)
       return context;
 
     return BrowserContextKeyedServiceFactory::GetBrowserContextToUse(context);
   }
 
-  virtual bool ServiceIsCreatedWithBrowserContext() const override {
+  bool ServiceIsCreatedWithBrowserContext() const override {
     return T::kServiceIsCreatedWithBrowserContext;
   }
 
-  virtual bool ServiceIsNULLWhileTesting() const override {
+  bool ServiceIsNULLWhileTesting() const override {
     return T::kServiceIsNULLWhileTesting;
   }
 
   DISALLOW_COPY_AND_ASSIGN(BrowserContextKeyedAPIFactory);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_BROWSER_CONTEXT_KEYED_API_FACTORY_H_