Standardize usage of virtual/override/final in components/

components/signin/core/browser/profile_oauth2_token_service.h

Index: components/signin/core/browser/profile_oauth2_token_service.h
diff --git a/components/signin/core/browser/profile_oauth2_token_service.h b/components/signin/core/browser/profile_oauth2_token_service.h
index fbc1fccc5a4ef8ffa0c49cb4fe462c2ea77c7f37..13210c1fcfe5ba4f087972a943d54bd36ab79aba 100644
--- a/components/signin/core/browser/profile_oauth2_token_service.h
+++ b/components/signin/core/browser/profile_oauth2_token_service.h
@@ -37,16 +37,16 @@ class SigninClient;
 class ProfileOAuth2TokenService : public OAuth2TokenService,
                                   public KeyedService {
  public:
-  virtual ~ProfileOAuth2TokenService();
+  ~ProfileOAuth2TokenService() override;
 
   // Initializes this token service with the SigninClient.
   virtual void Initialize(SigninClient* client);
 
   // KeyedService implementation.
-  virtual void Shutdown() override;
+  void Shutdown() override;
 
   // Lists account IDs of all accounts with a refresh token.
-  virtual std::vector<std::string> GetAccounts() override;
+  std::vector<std::string> GetAccounts() override;
 
   // Loads credentials from a backing persistent store to make them available
   // after service is used between profile restarts.
@@ -85,13 +85,12 @@ class ProfileOAuth2TokenService : public OAuth2TokenService,
   // concrete class.
 
   // Simply returns NULL and should be overriden by subsclasses.
-  virtual net::URLRequestContextGetter* GetRequestContext() override;
+  net::URLRequestContextGetter* GetRequestContext() override;
 
   // Updates the internal cache of the result from the most-recently-completed
   // auth request (used for reporting errors to the user).
-  virtual void UpdateAuthError(
-      const std::string& account_id,
-      const GoogleServiceAuthError& error) override;
+  void UpdateAuthError(const std::string& account_id,
+                       const GoogleServiceAuthError& error) override;
 
   // Validate that the account_id argument is valid.  This method DCHECKs
   // when invalid.