Add plumbing and support for crossfading StreamParserBuffers.

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index f5102b988dedbefa39db8188f4acaa63ba0f468c..2dd555ec6164afdbf019f79d17abc98d716ae1e0 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -322,12 +322,6 @@ class ChunkDemuxerStream : public DemuxerStream {
 
   void CompletePendingReadIfPossible_Locked();
 
-  // Gets the value to pass to the next Read() callback. Returns true if
-  // |status| and |buffer| should be passed to the callback. False indicates
-  // that |status| and |buffer| were not set and more data is needed.
-  bool GetNextBuffer_Locked(DemuxerStream::Status* status,
-                            scoped_refptr<StreamParserBuffer>* buffer);
-
   // Specifies the type of the stream.
   Type type_;