Introducing DecoderBuffer and general Buffer cleanup.

media/base/demuxer_stream.h

Index: media/base/demuxer_stream.h
diff --git a/media/base/demuxer_stream.h b/media/base/demuxer_stream.h
index 457818c795ac257c25d0b2e1e1824fd85c1f8463..4168d04ee3165260731e374a7e49b906e0400f28 100644
--- a/media/base/demuxer_stream.h
+++ b/media/base/demuxer_stream.h
@@ -12,7 +12,7 @@
 namespace media {
 
 class AudioDecoderConfig;
-class Buffer;
+class DecoderBuffer;
 class VideoDecoderConfig;
 
 class MEDIA_EXPORT DemuxerStream
@@ -30,7 +30,7 @@ class MEDIA_EXPORT DemuxerStream
   // Non-NULL buffer pointers will contain media data or signal the end of the
   // stream. A NULL pointer indicates an aborted Read(). This can happen if the
   // DemuxerStream gets flushed and doesn't have any more data to return.
-  typedef base::Callback<void(const scoped_refptr<Buffer>&)> ReadCB;
+  typedef base::Callback<void(const scoped_refptr<DecoderBuffer>&)> ReadCB;
   virtual void Read(const ReadCB& read_cb) = 0;
 
   // Returns the audio decoder configuration. It is an error to call this method