Remove enabled/set_enabled from DemuxerStream interface

media/filters/chunk_demuxer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_FILTERS_CHUNK_DEMUXER_H_
 #define MEDIA_FILTERS_CHUNK_DEMUXER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 96 matching lines @@
   void UnmarkEndOfStream();
 
   // DemuxerStream methods.
   void Read(const ReadCB& read_cb) override;
   Type type() const override;
   Liveness liveness() const override;
   AudioDecoderConfig audio_decoder_config() override;
   VideoDecoderConfig video_decoder_config() override;
   bool SupportsConfigChanges() override;
   VideoRotation video_rotation() override;
-  bool enabled() const override;
-  void set_enabled(bool enabled, base::TimeDelta timestamp) override;
+
+  bool enabled() const;
+  void set_enabled(bool enabled, base::TimeDelta timestamp);
 
   void SetStreamStatusChangeCB(const StreamStatusChangeCB& cb);
 
   // Returns the text track configuration.  It is an error to call this method
   // if type() != TEXT.
   TextTrackConfig text_track_config();
 
   // Sets the memory limit, in bytes, on the SourceBufferStream.
   void SetStreamMemoryLimit(size_t memory_limit);
 
@@ skipping 317 matching lines @@
   // released SourceBufferState objects. Demuxer clients might still have
   // references to these streams, so we need to keep them alive. But they'll be
   // in a shut down state, so reading from them will return EOS.
   std::vector<std::unique_ptr<ChunkDemuxerStream>> removed_streams_;
 
   // Accumulate, by type, detected track counts across the SourceBuffers.
   int detected_audio_track_count_;
   int detected_video_track_count_;
   int detected_text_track_count_;
 
-  std::map<MediaTrack::Id, DemuxerStream*> track_id_to_demux_stream_map_;
+  std::map<MediaTrack::Id, ChunkDemuxerStream*> track_id_to_demux_stream_map_;
 
   DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_CHUNK_DEMUXER_H_