Add OVERRIDE to content/.

content/browser/net/browser_online_state_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 CONTENT_BROWSER_NET_BROWSER_ONLINE_STATE_OBSERVER_H_
 #define CONTENT_BROWSER_NET_BROWSER_ONLINE_STATE_OBSERVER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "net/base/network_change_notifier.h"
 
 // Listens for changes to the online state and manages sending
 // updates to each RenderProcess via RenderProcessHost IPC.
 class CONTENT_EXPORT BrowserOnlineStateObserver
     : public net::NetworkChangeNotifier::OnlineStateObserver {
  public:
   BrowserOnlineStateObserver();
   virtual ~BrowserOnlineStateObserver();
 
   // OnlineStateObserver implementation.
-  virtual void OnOnlineStateChanged(bool online);
+  virtual void OnOnlineStateChanged(bool online) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserOnlineStateObserver);
 };
 
 #endif  // CONTENT_BROWSER_NET_BROWSER_ONLINE_STATE_OBSERVER_H_