WebRtcMediaStreamAdapterMap added.

content/renderer/media/webrtc/webrtc_media_stream_adapter.cc

 // Copyright 2014 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 "content/renderer/media/webrtc/webrtc_media_stream_adapter.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "content/renderer/media/media_stream_audio_track.h"
@@ skipping 18 matching lines @@
   web_stream_.AudioTracks(audio_tracks);
   for (blink::WebMediaStreamTrack& audio_track : audio_tracks)
     TrackAdded(audio_track);
 
   blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
   web_stream_.VideoTracks(video_tracks);
   for (blink::WebMediaStreamTrack& video_track : video_tracks)
     TrackAdded(video_track);
 
   MediaStream* const native_stream = MediaStream::GetMediaStream(web_stream_);
+  DCHECK(native_stream);
   native_stream->AddObserver(this);
 }
 
 WebRtcMediaStreamAdapter::~WebRtcMediaStreamAdapter() {
   MediaStream* const native_stream = MediaStream::GetMediaStream(web_stream_);
   native_stream->RemoveObserver(this);
 
   blink::WebVector<blink::WebMediaStreamTrack> audio_tracks;
   web_stream_.AudioTracks(audio_tracks);
   for (blink::WebMediaStreamTrack& audio_track : audio_tracks)
@@ skipping 40 matching lines @@
     webrtc_media_stream_->RemoveTrack(
         static_cast<webrtc::AudioTrackInterface*>(it->second->webrtc_track()));
   } else {
     webrtc_media_stream_->RemoveTrack(
         static_cast<webrtc::VideoTrackInterface*>(it->second->webrtc_track()));
   }
   adapter_refs_.erase(it);
 }
 
 }  // namespace content