Caching AudioOutputDevice instances in mixer manager

media/base/mock_audio_renderer_sink.h

 // Copyright (c) 2012 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 MEDIA_BASE_MOCK_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_MOCK_AUDIO_RENDERER_SINK_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace media {
 
-class FakeOutputDevice;
-
 class MockAudioRendererSink : public SwitchableAudioRendererSink {
  public:
   MockAudioRendererSink();
   explicit MockAudioRendererSink(OutputDeviceStatus device_status);
   MockAudioRendererSink(const std::string& device_id,
                         OutputDeviceStatus device_status);
   MockAudioRendererSink(const std::string& device_id,
                         OutputDeviceStatus device_status,
                         const AudioParameters& device_output_params);
 
@@ skipping 18 matching lines @@
  private:
   RenderCallback* callback_;
   OutputDeviceInfo output_device_info_;
 
   DISALLOW_COPY_AND_ASSIGN(MockAudioRendererSink);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MOCK_AUDIO_RENDERER_SINK_H_