Remove AudioDecoder from the Filter heirarchy.

media/base/mock_filters.h

Index: media/base/mock_filters.h
diff --git a/media/base/mock_filters.h b/media/base/mock_filters.h
index 30e09738d613542afd129042a3dad93ff86c32f0..b1ff760f88de3758e32f05cf7d7306258ad07780 100644
--- a/media/base/mock_filters.h
+++ b/media/base/mock_filters.h
@@ -16,6 +16,7 @@
 #include <string>
 
 #include "base/callback.h"
+#include "media/base/audio_decoder.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/demuxer.h"
 #include "media/base/filters.h"
@@ -203,12 +204,6 @@ class MockAudioDecoder : public AudioDecoder {
  public:
   MockAudioDecoder();
 
-  // Filter implementation.
-  MOCK_METHOD1(Stop, void(const base::Closure& callback));
-  MOCK_METHOD1(SetPlaybackRate, void(float playback_rate));
-  MOCK_METHOD2(Seek, void(base::TimeDelta time, const FilterStatusCB& cb));
-  MOCK_METHOD0(OnAudioRendererDisabled, void());
-
   // AudioDecoder implementation.
   MOCK_METHOD3(Initialize, void(DemuxerStream* stream,
                                 const PipelineStatusCB& callback,