Land Henrik's patch: http://codereview.chromium.org/6721027/

content/renderer/renderer_webaudiodevice_impl.h

 // Copyright (c) 2010 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/scoped_ptr.h"
+#include "base/ref_counted.h"
 #include "content/renderer/audio_device.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioDevice.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebVector.h"
 
 class RendererWebAudioDeviceImpl : public WebKit::WebAudioDevice,
                                    public AudioDevice::RenderCallback {
  public:
   RendererWebAudioDeviceImpl(size_t buffer_size,
                              int channels,
                              double sample_rate,
                              WebKit::WebAudioDevice::RenderCallback* callback);
   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 number_of_frames,
+                      size_t audio_delay_milliseconds);
 
  private:
-  scoped_ptr<AudioDevice> audio_device_;
+  scoped_refptr<AudioDevice> audio_device_;
 
   // 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_