Remove reference counting from media::Demuxer and friends.

media/filters/vpx_video_decoder.cc

Index: media/filters/vpx_video_decoder.cc
diff --git a/media/filters/vpx_video_decoder.cc b/media/filters/vpx_video_decoder.cc
index baab01741ab4a49bd3a02df5e400b0b80bbf0d12..1dedc270c9590a01f01e2166cd3de2313e6250ed 100644
--- a/media/filters/vpx_video_decoder.cc
+++ b/media/filters/vpx_video_decoder.cc
@@ -60,6 +60,7 @@ VpxVideoDecoder::VpxVideoDecoder(
     : message_loop_(message_loop),
       weak_factory_(this),
       state_(kUninitialized),
+      demuxer_stream_(NULL),
       vpx_codec_(NULL) {
 }
 
@@ -69,7 +70,7 @@ VpxVideoDecoder::~VpxVideoDecoder() {
 }
 
 void VpxVideoDecoder::Initialize(
-    const scoped_refptr<DemuxerStream>& stream,
+    DemuxerStream* stream,
     const PipelineStatusCB& status_cb,
     const StatisticsCB& statistics_cb) {
   DCHECK(message_loop_->BelongsToCurrentThread());