ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/modules/mediastream/MediaDevices.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MediaDevices_h
 #define MediaDevices_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "core/dom/SuspendableObject.h"
 #include "core/events/EventTarget.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
 #include "platform/AsyncMethodRunner.h"
 
 namespace blink {
 
 class MediaStreamConstraints;
 class MediaTrackSupportedConstraints;
 class ScriptState;
 class UserMediaController;
 
-class MODULES_EXPORT MediaDevices final : public EventTargetWithInlineData,
-                                          public ActiveScriptWrappable,
-                                          public SuspendableObject {
+class MODULES_EXPORT MediaDevices final
+    : public EventTargetWithInlineData,
+      public ActiveScriptWrappable<MediaDevices>,
+      public SuspendableObject {
   USING_GARBAGE_COLLECTED_MIXIN(MediaDevices);
   DEFINE_WRAPPERTYPEINFO();
   USING_PRE_FINALIZER(MediaDevices, dispose);
 
  public:
   static MediaDevices* create(ExecutionContext*);
   ~MediaDevices() override;
 
   ScriptPromise enumerateDevices(ScriptState*);
   void getSupportedConstraints(MediaTrackSupportedConstraints& result) {}
@@ skipping 37 matching lines @@
 
   bool m_observing;
   bool m_stopped;
   Member<AsyncMethodRunner<MediaDevices>> m_dispatchScheduledEventRunner;
   HeapVector<Member<Event>> m_scheduledEvents;
 };
 
 }  // namespace blink
 
 #endif