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

chrome/browser/signin/signin_manager_factory.h

Index: chrome/browser/signin/signin_manager_factory.h
diff --git a/chrome/browser/signin/signin_manager_factory.h b/chrome/browser/signin/signin_manager_factory.h
index 37eab4582dbb545d15359d3286459b165ff95254..3d00b066145b085e1666ab4e4a0bd8e90f87bd6b 100644
--- a/chrome/browser/signin/signin_manager_factory.h
+++ b/chrome/browser/signin/signin_manager_factory.h
@@ -54,7 +54,7 @@ class SigninManagerFactory : public BrowserContextKeyedServiceFactory {
 
   // Implementation of BrowserContextKeyedServiceFactory (public so tests
   // can call it).
-  virtual void RegisterProfilePrefs(
+  void RegisterProfilePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;
 
   // Registers the browser-global prefs used by SigninManager.
@@ -74,16 +74,15 @@ class SigninManagerFactory : public BrowserContextKeyedServiceFactory {
   friend struct DefaultSingletonTraits<SigninManagerFactory>;
 
   SigninManagerFactory();
-  virtual ~SigninManagerFactory();
+  ~SigninManagerFactory() override;
 
   // List of observers. Checks that list is empty on destruction.
   mutable ObserverList<Observer, true> observer_list_;
 
   // BrowserContextKeyedServiceFactory:
-  virtual KeyedService* BuildServiceInstanceFor(
+  KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
-  virtual void BrowserContextShutdown(content::BrowserContext* context)
-      override;
+  void BrowserContextShutdown(content::BrowserContext* context) override;
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_MANAGER_FACTORY_H_