Refactor MediaResource to be multi-stream capable

media/base/media_url_demuxer.cc

Index: media/base/media_url_demuxer.cc
diff --git a/media/base/media_url_demuxer.cc b/media/base/media_url_demuxer.cc
index 5e092fe49b89b379d64309e883eb5fe8faff9b6f..a75dfe45871161a9ecc42af9b062e6733be9d07d 100644
--- a/media/base/media_url_demuxer.cc
+++ b/media/base/media_url_demuxer.cc
@@ -18,9 +18,14 @@ MediaUrlDemuxer::MediaUrlDemuxer(
 MediaUrlDemuxer::~MediaUrlDemuxer() {}
 
 // Should never be called since MediaResource::Type is URL.
-DemuxerStream* MediaUrlDemuxer::GetStream(DemuxerStream::Type type) {
+std::vector<DemuxerStream*> MediaUrlDemuxer::GetStreams() {
+  NOTREACHED();
+  return std::vector<DemuxerStream*>();
+}
+
+// Should never be called since MediaResource::Type is URL.
+void MediaUrlDemuxer::SetStreamStatusChangeCB(const StreamStatusChangeCB& cb) {
   NOTREACHED();
-  return nullptr;
 }
 
 MediaUrlParams MediaUrlDemuxer::GetMediaUrlParams() const {