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

chrome/browser/sync/sync_error_controller.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_SYNC_SYNC_ERROR_CONTROLLER_H_
 #define CHROME_BROWSER_SYNC_SYNC_ERROR_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/observer_list.h"
 #include "chrome/browser/sync/profile_sync_service_observer.h"
 
 class Profile;
 class ProfileSyncService;
 
 // Keep track of sync errors and expose them to observers in the UI.
 class SyncErrorController : public ProfileSyncServiceObserver {
  public:
   // The observer class for SyncErrorController lets the controller notify
   // observers when an error arises or changes.
   class Observer {
    public:
     virtual ~Observer() {}
     virtual void OnErrorChanged() = 0;
   };
 
   explicit SyncErrorController(ProfileSyncService* service);
-  virtual ~SyncErrorController();
+  ~SyncErrorController() override;
 
   // True if there exists an error worth elevating to the user.
   bool HasError();
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // ProfileSyncServiceObserver:
-  virtual void OnStateChanged() override;
+  void OnStateChanged() override;
 
  private:
   ProfileSyncService* service_;
   ObserverList<Observer, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncErrorController);
 };
 
 #endif  // CHROME_BROWSER_SYNC_SYNC_ERROR_CONTROLLER_H_