Add OVERRIDE to content/.

content/renderer/media/media_stream_impl.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_RENDERER_MEDIA_STREAM_MEDIA_STREAM_IMPL_H_
 #define CONTENT_RENDERER_MEDIA_STREAM_MEDIA_STREAM_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "webkit/media/media_stream_client.h"
 
 class VideoCaptureImplManager;
 
 // A implementation of StreamClient to provide supporting functions, such as
 // GetVideoDecoder.
 class MediaStreamImpl
     : public webkit_media::MediaStreamClient,
       public base::RefCountedThreadSafe<MediaStreamImpl> {
  public:
   explicit MediaStreamImpl(VideoCaptureImplManager* vc_manager);
   virtual ~MediaStreamImpl();
 
   // Implement webkit_media::StreamClient.
   virtual scoped_refptr<media::VideoDecoder> GetVideoDecoder(
-      const GURL& url, media::MessageLoopFactory* message_loop_factory);
+      const GURL& url,
+      media::MessageLoopFactory* message_loop_factory) OVERRIDE;
 
  private:
   scoped_refptr<VideoCaptureImplManager> vc_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamImpl);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_STREAM_MEDIA_STREAM_IMPL_H_