Add OVERRIDE to chrome/renderer.

chrome/renderer/visitedlink_slave.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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_RENDERER_VISITEDLINK_SLAVE_H_
 #define CHROME_RENDERER_VISITEDLINK_SLAVE_H_
 #pragma once
 
+#include "base/compiler_specific.h"
 #include "base/shared_memory.h"
 #include "chrome/common/visitedlink_common.h"
 #include "content/public/renderer/render_process_observer.h"
 
 // Reads the link coloring database provided by the master. There can be any
 // number of slaves reading the same database.
 class VisitedLinkSlave : public VisitedLinkCommon,
                          public content::RenderProcessObserver {
  public:
   VisitedLinkSlave();
   virtual ~VisitedLinkSlave();
 
   // RenderProcessObserver implementation.
-  virtual bool OnControlMessageReceived(const IPC::Message& message);
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Message handlers.
   void OnUpdateVisitedLinks(base::SharedMemoryHandle table);
   void OnAddVisitedLinks(const VisitedLinkSlave::Fingerprints& fingerprints);
   void OnResetVisitedLinks();
  private:
   void FreeTable();
 
   // shared memory consists of a SharedHeader followed by the table
   base::SharedMemory* shared_memory_;
 
   DISALLOW_COPY_AND_ASSIGN(VisitedLinkSlave);
 };
 
 #endif  // CHROME_RENDERER_VISITEDLINK_SLAVE_H_