Move Liveness from DemuxerStreamProvider to DemuxerStream.

media/mojo/services/mojo_demuxer_stream_adapter.h

Index: media/mojo/services/mojo_demuxer_stream_adapter.h
diff --git a/media/mojo/services/mojo_demuxer_stream_adapter.h b/media/mojo/services/mojo_demuxer_stream_adapter.h
index 60b4a387c801d1a38eac1269e31c9553d11a9531..c5e5ce0812a05ee604ccaa5ccc3049aa04bfd53e 100644
--- a/media/mojo/services/mojo_demuxer_stream_adapter.h
+++ b/media/mojo/services/mojo_demuxer_stream_adapter.h
@@ -36,6 +36,7 @@ class MojoDemuxerStreamAdapter : public media::DemuxerStream,
   AudioDecoderConfig audio_decoder_config() override;
   VideoDecoderConfig video_decoder_config() override;
   Type type() override;
+  Liveness liveness() override;
   void EnableBitstreamConverter() override;
   bool SupportsConfigChanges() override;
   VideoRotation video_rotation() override;