Standardize usage of virtual/override/final in components/

components/signin/core/browser/mutable_profile_oauth2_token_service.h

Index: components/signin/core/browser/mutable_profile_oauth2_token_service.h
diff --git a/components/signin/core/browser/mutable_profile_oauth2_token_service.h b/components/signin/core/browser/mutable_profile_oauth2_token_service.h
index e7db6a2a4aa14b4b273ff5ca437b3d05a4d03988..a06efba58b9588e1a90ba5dbdfda40e60c026dba 100644
--- a/components/signin/core/browser/mutable_profile_oauth2_token_service.h
+++ b/components/signin/core/browser/mutable_profile_oauth2_token_service.h
@@ -20,17 +20,16 @@ class MutableProfileOAuth2TokenService : public ProfileOAuth2TokenService,
                                          public WebDataServiceConsumer  {
  public:
   // ProfileOAuth2TokenService overrides.
-  virtual void Shutdown() override;
-  virtual std::vector<std::string> GetAccounts() override;
+  void Shutdown() override;
+  std::vector<std::string> GetAccounts() override;
 
   // The below three methods should be called only on the thread on which this
   // object was created.
-  virtual void LoadCredentials(const std::string& primary_account_id) override;
-  virtual void UpdateCredentials(const std::string& account_id,
-                                 const std::string& refresh_token) override;
-  virtual void RevokeAllCredentials() override;
-  virtual bool RefreshTokenIsAvailable(const std::string& account_id) const
-      override;
+  void LoadCredentials(const std::string& primary_account_id) override;
+  void UpdateCredentials(const std::string& account_id,
+                         const std::string& refresh_token) override;
+  void RevokeAllCredentials() override;
+  bool RefreshTokenIsAvailable(const std::string& account_id) const override;
 
   // Revokes credentials related to |account_id|.
   void RevokeCredentials(const std::string& account_id);
@@ -41,7 +40,7 @@ class MutableProfileOAuth2TokenService : public ProfileOAuth2TokenService,
     AccountInfo(ProfileOAuth2TokenService* token_service,
                 const std::string& account_id,
                 const std::string& refresh_token);
-    virtual ~AccountInfo();
+    ~AccountInfo() override;
 
     const std::string& refresh_token() const { return refresh_token_; }
     void set_refresh_token(const std::string& token) {
@@ -51,9 +50,9 @@ class MutableProfileOAuth2TokenService : public ProfileOAuth2TokenService,
     void SetLastAuthError(const GoogleServiceAuthError& error);
 
     // SigninErrorController::AuthStatusProvider implementation.
-    virtual std::string GetAccountId() const override;
-    virtual std::string GetUsername() const override;
-    virtual GoogleServiceAuthError GetAuthStatus() const override;
+    std::string GetAccountId() const override;
+    std::string GetUsername() const override;
+    GoogleServiceAuthError GetAuthStatus() const override;
 
    private:
     ProfileOAuth2TokenService* token_service_;
@@ -72,19 +71,19 @@ class MutableProfileOAuth2TokenService : public ProfileOAuth2TokenService,
   friend class MutableProfileOAuth2TokenServiceTest;
 
   MutableProfileOAuth2TokenService();
-  virtual ~MutableProfileOAuth2TokenService();
+  ~MutableProfileOAuth2TokenService() override;
 
   // OAuth2TokenService implementation.
-  virtual OAuth2AccessTokenFetcher* CreateAccessTokenFetcher(
+  OAuth2AccessTokenFetcher* CreateAccessTokenFetcher(
       const std::string& account_id,
       net::URLRequestContextGetter* getter,
       OAuth2AccessTokenConsumer* consumer) override;
-  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;
 
   virtual std::string GetRefreshToken(const std::string& account_id) const;
 
@@ -103,9 +102,8 @@ class MutableProfileOAuth2TokenService : public ProfileOAuth2TokenService,
                            CanonicalizeAccountId);
 
   // WebDataServiceConsumer implementation:
-  virtual void OnWebDataServiceRequestDone(
-      WebDataServiceBase::Handle handle,
-      const WDTypedResult* result) override;
+  void OnWebDataServiceRequestDone(WebDataServiceBase::Handle handle,
+                                   const WDTypedResult* result) override;
 
   // Loads credentials into in memory stucture.
   void LoadAllCredentialsIntoMemory(