Standardize usage of virtual/override/final in components/

components/signin/core/browser/signin_tracker.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 COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_TRACKER_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_TRACKER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "components/signin/core/browser/signin_manager.h"
 #include "google_apis/gaia/google_service_auth_error.h"
@@ skipping 57 matching lines @@
   // Creates a SigninTracker that tracks the signin status on the passed
   // classes, and notifies the |observer| on status changes. All of the
   // instances with the exception of |account_reconcilor| must be non-null and
   // must outlive the SigninTracker. |account_reconcilor| will be used if it is
   // non-null.
   SigninTracker(ProfileOAuth2TokenService* token_service,
                 SigninManagerBase* signin_manager,
                 AccountReconcilor* account_reconcilor,
                 SigninClient* client,
                 Observer* observer);
-  virtual ~SigninTracker();
+  ~SigninTracker() override;
 
   // SigninManagerBase::Observer implementation.
-  virtual void GoogleSigninFailed(const GoogleServiceAuthError& error) override;
+  void GoogleSigninFailed(const GoogleServiceAuthError& error) override;
 
   // OAuth2TokenService::Observer implementation.
-  virtual void OnRefreshTokenAvailable(const std::string& account_id) override;
-  virtual void OnRefreshTokenRevoked(const std::string& account_id) override;
+  void OnRefreshTokenAvailable(const std::string& account_id) override;
+  void OnRefreshTokenRevoked(const std::string& account_id) override;
 
  private:
   // Initializes this by adding notifications and observers.
   void Initialize();
 
   // MergeSessionHelper::Observer implementation.
-  virtual void MergeSessionCompleted(
-      const std::string& account_id,
-      const GoogleServiceAuthError& error) override;
+  void MergeSessionCompleted(const std::string& account_id,
+                             const GoogleServiceAuthError& error) override;
 
   // The classes whose collective signin status we are tracking.
   ProfileOAuth2TokenService* token_service_;
   SigninManagerBase* signin_manager_;
   AccountReconcilor* account_reconcilor_;
 
   // The client associated with this instance.
   SigninClient* client_;
 
   // Weak pointer to the observer we call when the signin state changes.
   Observer* observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninTracker);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_TRACKER_H_