Remove MediaFormat once and for all.

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 eb8412d59ffcd63389940bb473b97fe98280f31a..c40440806d9ba287df7a51f3762077c44b01361e 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -80,7 +80,6 @@ class ChunkDemuxerStream : public DemuxerStream {
   // DemuxerStream methods.
   virtual void Read(const ReadCallback& read_callback);
   virtual Type type();
-  virtual const MediaFormat& media_format();
   virtual void EnableBitstreamConverter();
   virtual AVStream* GetAVStream();
 
@@ -88,7 +87,6 @@ class ChunkDemuxerStream : public DemuxerStream {
   static void RunCallback(ReadCallback cb, scoped_refptr<Buffer> buffer);
 
   Type type_;
-  MediaFormat media_format_;
   AVStream* av_stream_;
 
   mutable base::Lock lock_;
@@ -260,8 +258,6 @@ void ChunkDemuxerStream::Read(const ReadCallback& read_callback) {
 
 DemuxerStream::Type ChunkDemuxerStream::type() { return type_; }
 
-const MediaFormat& ChunkDemuxerStream::media_format() { return media_format_; }
-
 void ChunkDemuxerStream::EnableBitstreamConverter() {}
 
 AVStream* ChunkDemuxerStream::GetAVStream() { return av_stream_; }