Bug 1201363 - Do not copy video segment to StreamTracks in TrackUnionStream. r=jesup

Now everything is ready. We can make NotifyQueuedTrackChanges only triggered by TRACK_EVENT_CREATED and TRACK_EVENT_ENDED without breaking anything. Also we make TrackUnionStream no longer copying data in video case.

MozReview-Commit-ID: IgLx1mpBWB3

--HG--
extra : transplant_source : %9Fk%8F%20%FE%12%FC%DF%A0%C6%02%AC%D2%3C%EE%08%26%E3%9E%27

dom/media/MediaStreamGraph.cpp

@@ -241,16 +241,6 @@ MediaStreamGraphImpl::ExtractPendingInput(SourceMediaStream* aStream,
             l->NotifyQueuedTrackChanges(this, data->mID,
                                         offset, static_cast<TrackEventCommand>(data->mCommands), *data->mData);
           }
-        } else {
-          // Fixme: This part will be removed in the bug 1201363. It will be
-          // removed in changeset "Do not copy video segment to StreamTracks in
-          // TrackUnionStream."
-
-          // Dealing with video and not TRACK_CREATE and TRACK_END case.
-          for (MediaStreamListener* l : aStream->mListeners) {
-            l->NotifyQueuedTrackChanges(this, data->mID,
-                                        offset, static_cast<TrackEventCommand>(data->mCommands), *data->mData);
-          }
         }
       }
 

dom/media/TrackUnionStream.cpp

@@ -332,12 +332,6 @@ TrackUnionStream::TrackUnionStream() :
                                    *static_cast<AudioSegment*>(segment),
                                    map->mInputPort->GetSource(),
                                    map->mInputTrackID);
-        } else {
-          // This part will be removed in bug 1201363.
-          l->NotifyQueuedTrackChanges(Graph(), outputTrack->GetID(),
-                                      outputStart, TrackEventCommand::TRACK_EVENT_NONE, *segment,
-                                      map->mInputPort->GetSource(),
-                                      map->mInputTrackID);
         }
       }
       for (TrackBound<MediaStreamTrackListener>& b : mTrackListeners) {