Introduce VideoConfig/AudioConfig class for CMA backend

chromecast/media/cma/backend/audio_pipeline_device.h

 // Copyright 2014 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 CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_
 #define CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_
 
 #include "base/macros.h"
 #include "chromecast/media/cma/backend/media_component_device.h"
 
-namespace media {
-class AudioDecoderConfig;
-}
-
 namespace chromecast {
 namespace media {
 class AudioPipelineDeviceClient;
+struct AudioConfig;
 
 class AudioPipelineDevice : public MediaComponentDevice {
  public:
   AudioPipelineDevice();
   ~AudioPipelineDevice() override;
 
   // Provide the audio configuration.
   // Must be called before switching from |kStateUninitialized| to |kStateIdle|.
   // Afterwards, this can be invoked any time the configuration changes.
   // Returns true if the configuration is a supported configuration.
-  virtual bool SetConfig(const ::media::AudioDecoderConfig& config) = 0;
+  virtual bool SetConfig(const AudioConfig& config) = 0;
 
   // Sets the volume multiplier.
   // The multiplier must be in the range [0.0, 1.0].
   virtual void SetStreamVolumeMultiplier(float multiplier) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioPipelineDevice);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_