Removing DataSource from Filter hierarchy

media/base/demuxer.cc

 // Copyright (c) 2011 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.
 
 #include "media/base/demuxer.h"
 
 #include "base/logging.h"
 
 namespace media {
 
+DemuxerHost::~DemuxerHost() {}
+
 Demuxer::Demuxer() : host_(NULL) {}
 
 Demuxer::~Demuxer() {}
 
-void Demuxer::set_host(FilterHost* host) {
+void Demuxer::set_host(DemuxerHost* host) {
   DCHECK(host);
   DCHECK(!host_);
   host_ = host;
 }
 
 void Demuxer::SetPlaybackRate(float playback_rate) {}
 
 void Demuxer::Seek(base::TimeDelta time, const PipelineStatusCB& callback) {
   DCHECK(!callback.is_null());
   callback.Run(PIPELINE_OK);
 }
 
 void Demuxer::Stop(const base::Closure& callback) {
   DCHECK(!callback.is_null());
   callback.Run();
 }
 
 void Demuxer::OnAudioRendererDisabled() {}
 
 }  // namespace media