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

chrome/browser/signin/easy_unlock_service_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_SIGNIN_EASY_UNLOCK_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_FACTORY_H_
 
 #include "base/macros.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 namespace content {
 class BrowserContext;
 }
 
 template <typename T> struct DefaultSingletonTraits;
 class EasyUnlockService;
 class Profile;
 
 // Singleton factory that builds and owns all EasyUnlockService.
 class EasyUnlockServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   static EasyUnlockServiceFactory* GetInstance();
 
   static EasyUnlockService* GetForProfile(Profile* profile);
 
  private:
   friend struct DefaultSingletonTraits<EasyUnlockServiceFactory>;
 
   EasyUnlockServiceFactory();
-  virtual ~EasyUnlockServiceFactory();
+  ~EasyUnlockServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) 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;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_FACTORY_H_