ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/mediasource/MediaSource.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 33 matching lines @@
 #include <memory>
 
 namespace blink {
 
 class ExceptionState;
 class GenericEventQueue;
 class WebSourceBuffer;
 
 class MediaSource final : public EventTargetWithInlineData,
                           public HTMLMediaSource,
-                          public ActiveScriptWrappable,
+                          public ActiveScriptWrappable<MediaSource>,
                           public SuspendableObject {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(MediaSource);
 
  public:
   static const AtomicString& openKeyword();
   static const AtomicString& closedKeyword();
   static const AtomicString& endedKeyword();
 
   static MediaSource* create(ExecutionContext*);
@@ skipping 88 matching lines @@
   Member<SourceBufferList> m_activeSourceBuffers;
 
   Member<TimeRanges> m_liveSeekableRange;
 
   int m_addedToRegistryCounter;
 };
 
 }  // namespace blink
 
 #endif  // MediaSource_h