MediaStream API: Adding missing observer calls for remote tracks

Source/modules/mediastream/MediaStream.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Ericsson AB. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 308 matching lines @@
 
     RefPtr<MediaStreamTrack> track = MediaStreamTrack::create(executionContext(), component);
     switch (component->source()->type()) {
     case MediaStreamSource::TypeAudio:
         m_audioTracks.append(track);
         break;
     case MediaStreamSource::TypeVideo:
         m_videoTracks.append(track);
         break;
     }
+    track->addObserver(this);
     m_descriptor->addComponent(component);
 
     scheduleDispatchEvent(MediaStreamTrackEvent::create(EventTypeNames::addtrack, false, false, track));
 }
 
 void MediaStream::removeRemoteTrack(MediaStreamComponent* component)
 {
     if (ended())
         return;
 
@@ skipping 13 matching lines @@
             index = i;
             break;
         }
     }
     if (index == kNotFound)
         return;
 
     m_descriptor->removeComponent(component);
 
     RefPtr<MediaStreamTrack> track = (*tracks)[index];
+    track->removeObserver(this);
     tracks->remove(index);
     scheduleDispatchEvent(MediaStreamTrackEvent::create(EventTypeNames::removetrack, false, false, track));
 }
 
 void MediaStream::scheduleDispatchEvent(PassRefPtr<Event> event)
 {
     m_scheduledEvents.append(event);
 
     if (!m_scheduledEventTimer.isActive())
         m_scheduledEventTimer.startOneShot(0, FROM_HERE);
@@ skipping 13 matching lines @@
 
     events.clear();
 }
 
 URLRegistry& MediaStream::registry() const
 {
     return MediaStreamRegistry::registry();
 }
 
 } // namespace WebCore