Move Liveness from DemuxerStreamProvider to DemuxerStream.

media/mojo/services/mojo_demuxer_stream_adapter.cc

Index: media/mojo/services/mojo_demuxer_stream_adapter.cc
diff --git a/media/mojo/services/mojo_demuxer_stream_adapter.cc b/media/mojo/services/mojo_demuxer_stream_adapter.cc
index c1d20246629a0007556725289f00677af32dc5ac..bef0311e08139cf5bb4f79fe7566756e44d647f7 100644
--- a/media/mojo/services/mojo_demuxer_stream_adapter.cc
+++ b/media/mojo/services/mojo_demuxer_stream_adapter.cc
@@ -47,7 +47,7 @@ VideoDecoderConfig MojoDemuxerStreamAdapter::video_decoder_config() {
   return video_config_queue_.front();
 }
 
-DemuxerStream::Type MojoDemuxerStreamAdapter::type() {
+DemuxerStream::Type MojoDemuxerStreamAdapter::type() const {
   return type_;
 }
 
@@ -64,6 +64,7 @@ VideoRotation MojoDemuxerStreamAdapter::video_rotation() {
   return VIDEO_ROTATION_0;
 }
 
+// TODO(xhwang): Pass liveness here.
 void MojoDemuxerStreamAdapter::OnStreamReady(
     mojo::ScopedDataPipeConsumerHandle pipe) {
   DVLOG(1) << __FUNCTION__;