Reland: Remove reference counting from media::VideoDecoder and friends.

media/base/video_renderer.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_VIDEO_RENDERER_H_
 #define MEDIA_BASE_VIDEO_RENDERER_H_
 
-#include <list>
-
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "media/base/media_export.h"
 #include "media/base/pipeline_status.h"
 
 namespace gfx {
 class Size;
 }
 
 namespace media {
 
 class DemuxerStream;
 class VideoDecoder;
 
 class MEDIA_EXPORT VideoRenderer {
  public:
-  typedef std::list<scoped_refptr<VideoDecoder> > VideoDecoderList;
-
   // Used to update the pipeline's clock time. The parameter is the time that
   // the clock should not exceed.
   typedef base::Callback<void(base::TimeDelta)> TimeCB;
 
   // Executed when the natural size of the video has changed.
   typedef base::Callback<void(const gfx::Size& size)> NaturalSizeChangedCB;
 
   // Used to query the current time or duration of the media.
   typedef base::Callback<base::TimeDelta()> TimeDeltaCB;
 
   VideoRenderer();
   virtual ~VideoRenderer();
 
-  // Initialize a VideoRenderer with the given DemuxerStream and
-  // VideoDecoderList, executing |init_cb| callback upon completion.
+  // Initialize a VideoRenderer with |stream|, executing |init_cb| upon
+  // completion.
   //
   // |statistics_cb| is executed periodically with video rendering stats, such
   // as dropped frames.
   //
   // |time_cb| is executed whenever time has advanced by way of video rendering.
   //
   // |size_changed_cb| is executed whenever the dimensions of the video has
   // changed.
   //
   // |ended_cb| is executed when video rendering has reached the end of stream.
   //
   // |error_cb| is executed if an error was encountered.
   //
   // |get_time_cb| is used to query the current media playback time.
   //
   // |get_duration_cb| is used to query the media duration.
   virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
-                          const VideoDecoderList& decoders,
                           const PipelineStatusCB& init_cb,
                           const StatisticsCB& statistics_cb,
                           const TimeCB& time_cb,
                           const NaturalSizeChangedCB& size_changed_cb,
                           const base::Closure& ended_cb,
                           const PipelineStatusCB& error_cb,
                           const TimeDeltaCB& get_time_cb,
                           const TimeDeltaCB& get_duration_cb) = 0;
 
   // Start audio decoding and rendering at the current playback rate, executing
@@ skipping 21 matching lines @@
   // Updates the current playback rate.
   virtual void SetPlaybackRate(float playback_rate) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_RENDERER_H_