Reduce ActiveDOMObjects from modules/mediastream/

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

 /*
  * Copyright (C) 2014 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef MediaDevicesRequest_h
 #define MediaDevicesRequest_h
 
 #include "bindings/core/v8/ScriptPromise.h"
-#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "modules/ModulesExport.h"
 #include "modules/mediastream/MediaDeviceInfo.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class Document;
 class ExceptionState;
 class UserMediaController;
 class ScriptState;
 class ScriptPromiseResolver;
 
-class MODULES_EXPORT MediaDevicesRequest final : public GarbageCollectedFinalized<MediaDevicesRequest>, public ActiveDOMObject {
+// TODO(haraken): Make this GarbageCollected once the WillBe type is removed.
+class MODULES_EXPORT MediaDevicesRequest final : public GarbageCollectedFinalized<MediaDevicesRequest>, public ContextLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaDevicesRequest);
 public:
     static MediaDevicesRequest* create(ScriptState*, UserMediaController*);
-    ~MediaDevicesRequest() override;
 
     Document* ownerDocument();
 
     ScriptPromise start();
 
     void succeed(const MediaDeviceInfoVector&);
 
-    // ActiveDOMObject
-    void stop() override;
+    void contextDestroyed() override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     MediaDevicesRequest(ScriptState*, UserMediaController*);
 
     RawPtrWillBeMember<UserMediaController> m_controller;
     Member<ScriptPromiseResolver> m_resolver;
 };
 
 } // namespace blink
 
 #endif // MediaDevicesRequest_h