Add OVERRIDE to chrome/browser/chromeos/.

chrome/browser/chromeos/network_login_observer.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_NETWORK_LOGIN_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_NETWORK_LOGIN_OBSERVER_H_
 #pragma once
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/compiler_specific.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
 
 namespace views {
 class WidgetDelegate;
 }
 
 namespace chromeos {
 
 // The network login observer reshows a login dialog if there was an error.
 
 class NetworkLoginObserver : public NetworkLibrary::NetworkManagerObserver {
  public:
   explicit NetworkLoginObserver(NetworkLibrary* netlib);
   virtual ~NetworkLoginObserver();
 
   typedef std::map<std::string, bool> NetworkFailureMap;
  private:
   void CreateModalPopup(views::WidgetDelegate* view);
 
   // NetworkLibrary::NetworkManagerObserver implementation.
-  virtual void OnNetworkManagerChanged(NetworkLibrary* obj);
+  virtual void OnNetworkManagerChanged(NetworkLibrary* obj) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkLoginObserver);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NETWORK_LOGIN_OBSERVER_H_