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

chrome/browser/ui/webui/help/version_updater_mac.h

 // Copyright (c) 2012 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_UI_WEBUI_HELP_VERSION_UPDATER_MAC_H_
 #define CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_MAC_H_
 
 #import <AppKit/AppKit.h>
 
 #include "base/compiler_specific.h"
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/browser/ui/webui/help/version_updater.h"
 
 @class KeystoneObserver;
 
 // OS X implementation of version update functionality, used by the WebUI
 // About/Help page.
 class VersionUpdaterMac : public VersionUpdater {
  public:
   // VersionUpdater implementation.
-  virtual void CheckForUpdate(const StatusCallback& status_callback,
-                              const PromoteCallback& promote_callback) override;
-  virtual void PromoteUpdater() const override;
-  virtual void RelaunchBrowser() const override;
+  void CheckForUpdate(const StatusCallback& status_callback,
+                      const PromoteCallback& promote_callback) override;
+  void PromoteUpdater() const override;
+  void RelaunchBrowser() const override;
 
   // Process status updates received from Keystone. The dictionary will contain
   // an AutoupdateStatus value as an intValue at key kAutoupdateStatusStatus. If
   // a version is available (see AutoupdateStatus), it will be present at key
   // kAutoupdateStatusVersion.
   void UpdateStatus(NSDictionary* status);
 
  protected:
   friend class VersionUpdater;
 
   // Clients must use VersionUpdater::Create().
   VersionUpdaterMac();
-  virtual ~VersionUpdaterMac();
+  ~VersionUpdaterMac() override;
 
  private:
   // Update the visibility state of promote button.
   void UpdateShowPromoteButton();
 
   // Callback used to communicate update status to the client.
   StatusCallback status_callback_;
 
   // Callback used to show or hide the promote UI elements.
   PromoteCallback promote_callback_;
 
   // The visible state of the promote button.
   bool show_promote_button_;
 
   // The observer that will receive keystone status updates.
   base::scoped_nsobject<KeystoneObserver> keystone_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(VersionUpdaterMac);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_VERSION_UPDATER_MAC_H_