Add OVERRIDE to chrome/browser/chromeos/.

chrome/browser/chromeos/locale_change_guard.h

 // Copyright (c) 2011 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_CHROMEOS_LOCALE_CHANGE_GUARD_H_
 #define CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_
 #pragma once
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/notifications/system_notification.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_types.h"
 
 class Profile;
 
@@ skipping 22 matching lines @@
  private:
   class Delegate;
 
   void RevertLocaleChange(const base::ListValue* list);
   void AcceptLocaleChange();
   void Check();
 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
-                       const content::NotificationDetails& details);
+                       const content::NotificationDetails& details) OVERRIDE;
 
   std::string from_locale_;
   std::string to_locale_;
   Profile* profile_;
   scoped_ptr<chromeos::SystemNotification> note_;
   bool reverted_;
   content::NotificationRegistrar registrar_;
 
   // We want to show locale change notification in previous language however
   // we cannot directly load strings for non-current locale.  So we cache
   // messages before locale change.
   string16 title_text_;
   string16 message_text_;
   string16 revert_link_text_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_