Fix various operations in ChunkDemuxer that were not being applied to text tracks.

media/filters/chunk_demuxer.h

Index: media/filters/chunk_demuxer.h
diff --git a/media/filters/chunk_demuxer.h b/media/filters/chunk_demuxer.h
index d05063209e2d6bad3998a0738687f134a05a200e..5a0d59511ffa3f1154ba61bc57da5df4ddca66ba 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -218,6 +218,9 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   // Seeks all SourceBufferStreams to |seek_time|.
   void SeekAllSources(base::TimeDelta seek_time);
 
+  // Calls Shutdown() on all DemuxerStreams.
+  void ShutdownAllStreams();
+
   mutable base::Lock lock_;
   State state_;
   bool cancel_next_seek_;