ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/core/css/MediaQueryList.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 23 matching lines @@
 class MediaQueryListListener;
 class MediaQueryMatcher;
 class MediaQuerySet;
 
 // MediaQueryList interface is specified at
 // http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
 // The objects of this class are returned by window.matchMedia. They may be used
 // to retrieve the current value of the given media query and to add/remove
 // listeners that will be called whenever the value of the query changes.
 
-class CORE_EXPORT MediaQueryList final : public EventTargetWithInlineData,
-                                         public ActiveScriptWrappable,
-                                         public SuspendableObject {
+class CORE_EXPORT MediaQueryList final
+    : public EventTargetWithInlineData,
+      public ActiveScriptWrappable<MediaQueryList>,
+      public SuspendableObject {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(MediaQueryList);
   WTF_MAKE_NONCOPYABLE(MediaQueryList);
 
  public:
   static MediaQueryList* create(ExecutionContext*,
                                 MediaQueryMatcher*,
                                 MediaQuerySet*);
   ~MediaQueryList() override;
 
@@ skipping 36 matching lines @@
   Member<MediaQuerySet> m_media;
   using ListenerList = HeapListHashSet<Member<MediaQueryListListener>>;
   ListenerList m_listeners;
   bool m_matchesDirty;
   bool m_matches;
 };
 
 }  // namespace blink
 
 #endif  // MediaQueryList_h