Remove reference counting from media::DemuxerStream and friends.

media/base/demuxer_stream.h

 // Copyright (c) 2012 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_BASE_DEMUXER_STREAM_H_
 #define MEDIA_BASE_DEMUXER_STREAM_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/media_export.h"
 #include "media/base/ranges.h"
 
 namespace media {
 
 class AudioDecoderConfig;
 class DecoderBuffer;
 class VideoDecoderConfig;
 
-class MEDIA_EXPORT DemuxerStream
-    : public base::RefCountedThreadSafe<DemuxerStream> {
+class MEDIA_EXPORT DemuxerStream {
  public:
   enum Type {
     UNKNOWN,
     AUDIO,
     VIDEO,
     NUM_TYPES,  // Always keep this entry as the last one!
   };
 
   // Status returned in the Read() callback.
   //  kOk : Indicates the second parameter is Non-NULL and contains media data
@@ skipping 32 matching lines @@
   // Returns the video decoder configuration. It is an error to call this method
   // if type() != VIDEO.
   virtual const VideoDecoderConfig& video_decoder_config() = 0;
 
   // Returns the type of stream.
   virtual Type type() = 0;
 
   virtual void EnableBitstreamConverter() = 0;
 
  protected:
-  friend class base::RefCountedThreadSafe<DemuxerStream>;
+  // Only allow concrete implementations to get deleted.
   virtual ~DemuxerStream();
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DEMUXER_STREAM_H_