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

media/base/filter_collection.h

Index: media/base/filter_collection.h
diff --git a/media/base/filter_collection.h b/media/base/filter_collection.h
index e8b62f83770ad1d90a2fd3856f9f31d3cf0c1714..07266c6b836bfad197ef9126c2045fe94e4515ed 100644
--- a/media/base/filter_collection.h
+++ b/media/base/filter_collection.h
@@ -5,8 +5,6 @@
 #ifndef MEDIA_BASE_FILTER_COLLECTION_H_
 #define MEDIA_BASE_FILTER_COLLECTION_H_
 
-#include <list>
-
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
@@ -15,7 +13,6 @@ namespace media {
 
 class AudioRenderer;
 class Demuxer;
-class VideoDecoder;
 class VideoRenderer;
 
 // Represents a set of uninitialized demuxer and audio/video decoders and
@@ -25,8 +22,6 @@ class VideoRenderer;
 // http://crbug.com/110800
 class MEDIA_EXPORT FilterCollection {
  public:
-  typedef std::list<scoped_refptr<VideoDecoder> > VideoDecoderList;
-
   FilterCollection();
   ~FilterCollection();
 
@@ -39,11 +34,8 @@ class MEDIA_EXPORT FilterCollection {
   void SetVideoRenderer(scoped_ptr<VideoRenderer> video_renderer);
   scoped_ptr<VideoRenderer> GetVideoRenderer();
 
-  VideoDecoderList* GetVideoDecoders();
-
  private:
   scoped_refptr<Demuxer> demuxer_;
-  VideoDecoderList video_decoders_;
   scoped_ptr<AudioRenderer> audio_renderer_;
   scoped_ptr<VideoRenderer> video_renderer_;