Remove DemuxerFactory and URL parameter from Pipeline.

media/filters/dummy_demuxer.cc

Index: media/filters/dummy_demuxer.cc
diff --git a/media/filters/dummy_demuxer.cc b/media/filters/dummy_demuxer.cc
index 1a8f43b6b297ba59ce6a6a142de3d18af41f507c..d5692daca9bc74a162ca6421b7e06b0583117f74 100644
--- a/media/filters/dummy_demuxer.cc
+++ b/media/filters/dummy_demuxer.cc
@@ -47,8 +47,8 @@ DummyDemuxer::DummyDemuxer(bool has_video, bool has_audio, bool local_source)
 
 DummyDemuxer::~DummyDemuxer() {}
 
-int DummyDemuxer::GetBitrate() {
-  return 0;
+void DummyDemuxer::Initialize(const PipelineStatusCB& status_cb) {
+  status_cb.Run(PIPELINE_OK);
 }
 
 scoped_refptr<DemuxerStream> DummyDemuxer::GetStream(DemuxerStream::Type type) {
@@ -64,6 +64,10 @@ base::TimeDelta DummyDemuxer::GetStartTime() const {
   return base::TimeDelta();
 }
 
+int DummyDemuxer::GetBitrate() {
+  return 0;
+}
+
 bool DummyDemuxer::IsLocalSource() {
   return local_source_;
 }