Move Liveness from DemuxerStreamProvider to DemuxerStream.

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 c4e6b8478380de81a70ee42ac894d376a3cf770a..ea93bfc42a81321e4df292bcda30940a863e2eb3 100644
--- a/media/filters/decrypting_demuxer_stream.cc
+++ b/media/filters/decrypting_demuxer_stream.cc
@@ -126,6 +126,11 @@ DemuxerStream::Type DecryptingDemuxerStream::type() {
   return demuxer_stream_->type();
 }
 
+DemuxerStream::Liveness DecryptingDemuxerStream::liveness() {
+  DCHECK(state_ != kUninitialized && state_ != kDecryptorRequested) << state_;
+  return demuxer_stream_->liveness();
+}
+
 void DecryptingDemuxerStream::EnableBitstreamConverter() {
   demuxer_stream_->EnableBitstreamConverter();
 }