Remove reference counting from media::Demuxer and friends.

media/base/demuxer.h

Index: media/base/demuxer.h
diff --git a/media/base/demuxer.h b/media/base/demuxer.h
index 34150af00b3f9c9a433b7d886cbbed433a1a5b4f..0a9a15b17fd30e766080e1697e1d450a96b36af0 100644
--- a/media/base/demuxer.h
+++ b/media/base/demuxer.h
@@ -5,7 +5,6 @@
 #ifndef MEDIA_BASE_DEMUXER_H_
 #define MEDIA_BASE_DEMUXER_H_
 
-#include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "media/base/data_source.h"
 #include "media/base/demuxer_stream.h"
@@ -28,9 +27,10 @@ class MEDIA_EXPORT DemuxerHost : public DataSourceHost {
   virtual ~DemuxerHost();
 };
 
-class MEDIA_EXPORT Demuxer : public base::RefCountedThreadSafe<Demuxer> {
+class MEDIA_EXPORT Demuxer {
  public:
   Demuxer();
+  virtual ~Demuxer();
 
   // Completes initialization of the demuxer.
   //
@@ -64,10 +64,6 @@ class MEDIA_EXPORT Demuxer : public base::RefCountedThreadSafe<Demuxer> {
   // Returns the starting time for the media file.
   virtual base::TimeDelta GetStartTime() const = 0;
 
- protected:
-  friend class base::RefCountedThreadSafe<Demuxer>;
-  virtual ~Demuxer();
-
  private:
   DISALLOW_COPY_AND_ASSIGN(Demuxer);
 };