Revert of Reduce ActiveDOMObjects from modules/mediastream/

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

 /*
  * Copyright (C) 2012 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 APPLE INC. AND ITS CONTRIBUTORS ``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 APPLE INC. OR ITS 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 RTCStatsRequestImpl_h
 #define RTCStatsRequestImpl_h
 
-#include "core/dom/ContextLifecycleObserver.h"
+#include "core/dom/ActiveDOMObject.h"
 #include "modules/mediastream/RTCStatsResponse.h"
 #include "platform/heap/Handle.h"
 #include "platform/mediastream/RTCStatsRequest.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class MediaStreamTrack;
 class RTCPeerConnection;
 class RTCStatsCallback;
 
-class RTCStatsRequestImpl final : public RTCStatsRequest, public ContextLifecycleObserver {
+class RTCStatsRequestImpl final : public RTCStatsRequest, public ActiveDOMObject {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RTCStatsRequestImpl);
 public:
     static RTCStatsRequestImpl* create(ExecutionContext*, RTCPeerConnection*, RTCStatsCallback*, MediaStreamTrack*);
     ~RTCStatsRequestImpl() override;
 
     RTCStatsResponseBase* createResponse() override;
     bool hasSelector() override;
     MediaStreamComponent* component() override;
 
     void requestSucceeded(RTCStatsResponseBase*) override;
 
-    void contextDestroyed() override;
+    // ActiveDOMObject
+    void stop() override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     RTCStatsRequestImpl(ExecutionContext*, RTCPeerConnection*, RTCStatsCallback*, MediaStreamTrack*);
 
     void clear();
 
     Member<RTCStatsCallback> m_successCallback;
     Member<MediaStreamComponent> m_component;
     Member<RTCPeerConnection> m_requester;
 };
 
 } // namespace blink
 
 #endif // RTCStatsRequestImpl_h