ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 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 42 matching lines @@
 
 MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context,
                                            MediaStreamComponent* component) {
   MediaStreamTrack* track = new MediaStreamTrack(context, component);
   track->suspendIfNeeded();
   return track;
 }
 
 MediaStreamTrack::MediaStreamTrack(ExecutionContext* context,
                                    MediaStreamComponent* component)
-    : ActiveScriptWrappable(this),
+    : ActiveScriptWrappable<MediaStreamTrack>(this),
       SuspendableObject(context),
       m_readyState(MediaStreamSource::ReadyStateLive),
       m_isIteratingRegisteredMediaStreams(false),
       m_stopped(false),
       m_component(component),
       // The source's constraints aren't yet initialized at creation time.
       m_constraints() {
   m_component->source()->addObserver(this);
 }
 
@@ skipping 243 matching lines @@
 }
 
 DEFINE_TRACE(MediaStreamTrack) {
   visitor->trace(m_registeredMediaStreams);
   visitor->trace(m_component);
   EventTargetWithInlineData::trace(visitor);
   SuspendableObject::trace(visitor);
 }
 
 }  // namespace blink