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

chrome/browser/dom_distiller/dom_distiller_service_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_DOM_DISTILLER_DOM_DISTILLER_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_DOM_DISTILLER_DOM_DISTILLER_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/dom_distiller/core/distilled_page_prefs.h"
 #include "components/dom_distiller/core/dom_distiller_service.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 namespace content {
 class BrowserContext;
 }  // namespace content
 
 namespace dom_distiller {
 
 // A simple wrapper for DomDistillerService to expose it as a
 // KeyedService.
 class DomDistillerContextKeyedService : public KeyedService,
                                         public DomDistillerService {
  public:
   DomDistillerContextKeyedService(
       scoped_ptr<DomDistillerStoreInterface> store,
       scoped_ptr<DistillerFactory> distiller_factory,
       scoped_ptr<DistillerPageFactory> distiller_page_factory,
       scoped_ptr<DistilledPagePrefs> distilled_page_prefs);
-  virtual ~DomDistillerContextKeyedService() {}
+  ~DomDistillerContextKeyedService() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DomDistillerContextKeyedService);
 };
 
 class DomDistillerServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   static DomDistillerServiceFactory* GetInstance();
   static DomDistillerContextKeyedService* GetForBrowserContext(
       content::BrowserContext* context);
 
  private:
   friend struct DefaultSingletonTraits<DomDistillerServiceFactory>;
 
   DomDistillerServiceFactory();
-  virtual ~DomDistillerServiceFactory();
+  ~DomDistillerServiceFactory() override;
 
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 
-  virtual content::BrowserContext* GetBrowserContextToUse(
+  content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 };
 
 }  // namespace dom_distiller
 
 #endif  // CHROME_BROWSER_DOM_DISTILLER_DOM_DISTILLER_SERVICE_FACTORY_H_