Remove reference counting from media::Demuxer and friends.

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 56b523a65e7b6a82ecda6584f5c2b63fecce4c9f..bd4fd9cb04cba840237de2be13ef9fc9dcc2ddae 100644
--- a/media/base/mock_filters.h
+++ b/media/base/mock_filters.h
@@ -27,6 +27,7 @@ namespace media {
 class MockDemuxer : public Demuxer {
  public:
   MockDemuxer();
+  virtual ~MockDemuxer();
 
   // Demuxer implementation.
   MOCK_METHOD2(Initialize, void(DemuxerHost* host, const PipelineStatusCB& cb));
@@ -37,9 +38,6 @@ class MockDemuxer : public Demuxer {
   MOCK_METHOD1(GetStream, scoped_refptr<DemuxerStream>(DemuxerStream::Type));
   MOCK_CONST_METHOD0(GetStartTime, base::TimeDelta());
 
- protected:
-  virtual ~MockDemuxer();
-
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDemuxer);
 };