Add OVERRIDE to content/.

content/renderer/renderer_webaudiodevice_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_RENDERER_WEBAUDIODEVICE_IMPL_H_
 #define CONTENT_RENDERER_RENDERER_WEBAUDIODEVICE_IMPL_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 11 matching lines @@
   virtual ~RendererWebAudioDeviceImpl();
 
   // WebKit::WebAudioDevice implementation.
   virtual void start();
   virtual void stop();
   virtual double sampleRate();
 
   // AudioDevice::RenderCallback implementation.
   virtual void Render(const std::vector<float*>& audio_data,
                       size_t number_of_frames,
-                      size_t audio_delay_milliseconds);
+                      size_t audio_delay_milliseconds) OVERRIDE;
 
  private:
   scoped_refptr<AudioDevice> audio_device_;
   bool is_running_;
 
   // Weak reference to the callback into WebKit code.
   WebKit::WebAudioDevice::RenderCallback* client_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl);
 };
 
 #endif  // CONTENT_RENDERER_RENDERER_WEBAUDIODEVICE_IMPL_H_