Refactor MediaResource to be multi-stream capable

media/filters/decrypting_demuxer_stream.cc

Index: media/filters/decrypting_demuxer_stream.cc
diff --git a/media/filters/decrypting_demuxer_stream.cc b/media/filters/decrypting_demuxer_stream.cc
index 00e70e22a1692e3f29817ba9a337b2f4de017926..129b0ca8058d0185a9cc613812759ecbc3b3867a 100644
--- a/media/filters/decrypting_demuxer_stream.cc
+++ b/media/filters/decrypting_demuxer_stream.cc
@@ -162,11 +162,6 @@ void DecryptingDemuxerStream::set_enabled(bool enabled,
   demuxer_stream_->set_enabled(enabled, timestamp);
 }
 
-void DecryptingDemuxerStream::SetStreamStatusChangeCB(
-    const StreamStatusChangeCB& cb) {
-  demuxer_stream_->SetStreamStatusChangeCB(cb);
-}
-
 DecryptingDemuxerStream::~DecryptingDemuxerStream() {
   DVLOG(2) << __func__ << " : state_ = " << state_;
   DCHECK(task_runner_->BelongsToCurrentThread());