Oilpan: Move MediaStreamSource, MediaStreamComponent and MediaStreamDescriptor to oilpan's heap

Source/modules/mediastream/MediaStreamTrack.cpp

Index: Source/modules/mediastream/MediaStreamTrack.cpp
diff --git a/Source/modules/mediastream/MediaStreamTrack.cpp b/Source/modules/mediastream/MediaStreamTrack.cpp
index ebdb8a9e588b3bfa3a613e26a6283f7bffa9b752..0ab4f5f479c3f794f9bec0d066c17e94a842bb1c 100644
--- a/Source/modules/mediastream/MediaStreamTrack.cpp
+++ b/Source/modules/mediastream/MediaStreamTrack.cpp
@@ -59,7 +59,6 @@ MediaStreamTrack::MediaStreamTrack(ExecutionContext* context, MediaStreamCompone
 
 MediaStreamTrack::~MediaStreamTrack()
 {
-    m_component->source()->removeObserver(this);
 }
 
 String MediaStreamTrack::kind() const
@@ -147,9 +146,9 @@ void MediaStreamTrack::stopTrack(ExceptionState& exceptionState)
 
 MediaStreamTrack* MediaStreamTrack::clone(ExecutionContext* context)
 {
-    RefPtr<MediaStreamComponent> clonedComponent = MediaStreamComponent::create(component()->source());
-    MediaStreamTrack* clonedTrack = MediaStreamTrack::create(context, clonedComponent.get());
-    MediaStreamCenter::instance().didCreateMediaStreamTrack(clonedComponent.get());
+    MediaStreamComponent* clonedComponent = MediaStreamComponent::create(component()->source());
+    MediaStreamTrack* clonedTrack = MediaStreamTrack::create(context, clonedComponent);
+    MediaStreamCenter::instance().didCreateMediaStreamTrack(clonedComponent);
     return clonedTrack;
 }
 
@@ -230,7 +229,9 @@ ExecutionContext* MediaStreamTrack::executionContext() const
 void MediaStreamTrack::trace(Visitor* visitor)
 {
     visitor->trace(m_registeredMediaStreams);
+    visitor->trace(m_component);
     EventTargetWithInlineData::trace(visitor);
+    MediaStreamSource::Observer::trace(visitor);
 }
 
 } // namespace blink