Revert of Allow muting/unmuting audio through media track API

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 d1c150a1128e350337140c6b22786a06a903afa2..f60c9cdf8f46419231e2e9faa629f514eb42b566 100644
--- a/media/base/mock_filters.h
+++ b/media/base/mock_filters.h
@@ -18,7 +18,6 @@
 #include "media/base/decoder_buffer.h"
 #include "media/base/decryptor.h"
 #include "media/base/demuxer.h"
-#include "media/base/media_tracks.h"
 #include "media/base/pipeline.h"
 #include "media/base/pipeline_status.h"
 #include "media/base/renderer.h"
@@ -116,10 +115,6 @@ class MockDemuxer : public Demuxer {
   MOCK_CONST_METHOD0(GetTimelineOffset, base::Time());
   MOCK_CONST_METHOD0(GetMemoryUsage, int64_t());
 
-  MOCK_METHOD2(OnTrackIdsAssigned,
-               void(const MediaTracks&, const std::vector<unsigned>&));
-  MOCK_CONST_METHOD1(GetDemuxerStreamByTrackId, const DemuxerStream*(unsigned));
-
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDemuxer);
 };