Replace AudioDecoderConfig with simple accessors on AudioDecoder.

media/filters/null_audio_renderer.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 MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
 #define MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_
 
 // NullAudioRenderer effectively uses an extra thread to "throw away" the
 // audio data at a rate resembling normal playback speed.  It's just like
 // decoding to /dev/null!
@@ skipping 20 matching lines @@
   virtual ~NullAudioRenderer();
 
   // AudioRenderer implementation.
   virtual void SetVolume(float volume);
 
   // PlatformThread::Delegate implementation.
   virtual void ThreadMain();
 
  protected:
   // AudioRendererBase implementation.
-  virtual bool OnInitialize(const AudioDecoderConfig& config);
+  virtual bool OnInitialize(int bits_per_channel,
+                            ChannelLayout channel_layout,
+                            int sample_rate);
   virtual void OnStop();
 
  private:
   // A number to convert bytes written in FillBuffer to milliseconds based on
   // the audio format.
   size_t bytes_per_millisecond_;
 
   // A buffer passed to FillBuffer to advance playback.
   scoped_array<uint8> buffer_;
   size_t buffer_size_;
 
   // Separate thread used to throw away data.
   base::PlatformThreadHandle thread_;
 
   // Shutdown flag.
   bool shutdown_;
 
   DISALLOW_COPY_AND_ASSIGN(NullAudioRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_NULL_AUDIO_RENDERER_H_