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

media/base/filter_collection.cc

Index: media/base/filter_collection.cc
diff --git a/media/base/filter_collection.cc b/media/base/filter_collection.cc
index 148a192e7ce419c69dbcd4bc5fde07fe7505bab4..911edd5832cd6150b57283af53f80eeed9df8f9a 100644
--- a/media/base/filter_collection.cc
+++ b/media/base/filter_collection.cc
@@ -7,7 +7,6 @@
 #include "base/logging.h"
 #include "media/base/audio_renderer.h"
 #include "media/base/demuxer.h"
-#include "media/base/video_decoder.h"
 #include "media/base/video_renderer.h"
 
 namespace media {
@@ -42,8 +41,4 @@ scoped_ptr<VideoRenderer> FilterCollection::GetVideoRenderer() {
   return video_renderer_.Pass();
 }
 
-FilterCollection::VideoDecoderList* FilterCollection::GetVideoDecoders() {
-  return &video_decoders_;
-}
-
 }  // namespace media