Remove reference counting from media::DemuxerStream and friends.

media/filters/decrypting_video_decoder.cc

Index: media/filters/decrypting_video_decoder.cc
diff --git a/media/filters/decrypting_video_decoder.cc b/media/filters/decrypting_video_decoder.cc
index 9a7647f9d09a2261cce66e89a961bd795eb0b848..62de8f5b6ed83e23e27deb2db2b85aceba726ef6 100644
--- a/media/filters/decrypting_video_decoder.cc
+++ b/media/filters/decrypting_video_decoder.cc
@@ -26,6 +26,7 @@ DecryptingVideoDecoder::DecryptingVideoDecoder(
     : message_loop_(message_loop),
       weak_factory_(this),
       state_(kUninitialized),
+      demuxer_stream_(NULL),
       set_decryptor_ready_cb_(set_decryptor_ready_cb),
       decryptor_(NULL),
       key_added_while_decode_pending_(false),
@@ -33,7 +34,7 @@ DecryptingVideoDecoder::DecryptingVideoDecoder(
 }
 
 void DecryptingVideoDecoder::Initialize(
-    const scoped_refptr<DemuxerStream>& stream,
+    DemuxerStream* stream,
     const PipelineStatusCB& status_cb,
     const StatisticsCB& statistics_cb) {
   DVLOG(2) << "Initialize()";