Allow PeerConnection to be garbage collected after close().

Source/modules/mediastream/RTCStatsRequestImpl.cpp

 /*
  * 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.
  */
 
 #include "config.h"
 
 #include "modules/mediastream/RTCStatsRequestImpl.h"
 
 #include "modules/mediastream/MediaStreamTrack.h"
+#include "modules/mediastream/RTCPeerConnection.h"
 #include "modules/mediastream/RTCStatsCallback.h"
 
 namespace WebCore {
 
-PassRefPtr<RTCStatsRequestImpl> RTCStatsRequestImpl::create(ExecutionContext* context, PassOwnPtr<RTCStatsCallback> callback, PassRefPtr<MediaStreamTrack> selector)
+PassRefPtr<RTCStatsRequestImpl> RTCStatsRequestImpl::create(ExecutionContext* context, RTCPeerConnection* requester, PassOwnPtr<RTCStatsCallback> callback, PassRefPtr<MediaStreamTrack> selector)
 {
-    RefPtr<RTCStatsRequestImpl> request = adoptRef(new RTCStatsRequestImpl(context, callback, selector));
+    RefPtr<RTCStatsRequestImpl> request = adoptRef(new RTCStatsRequestImpl(context, requester, callback, selector));
     request->suspendIfNeeded();
     return request.release();
 }
 
-RTCStatsRequestImpl::RTCStatsRequestImpl(ExecutionContext* context, PassOwnPtr<RTCStatsCallback> callback, PassRefPtr<MediaStreamTrack> selector)
+RTCStatsRequestImpl::RTCStatsRequestImpl(ExecutionContext* context, RTCPeerConnection* requester, PassOwnPtr<RTCStatsCallback> callback, PassRefPtr<MediaStreamTrack> selector)
     : ActiveDOMObject(context)
     , m_successCallback(callback)
     , m_component(selector ? selector->component() : 0)
+    , m_requester(requester)
 {
+    ASSERT(m_requester);
 }
 
 RTCStatsRequestImpl::~RTCStatsRequestImpl()
 {
+    if (m_requester)
+        m_requester->requestCompletedCheckIfCallbackShouldFire();
 }
 
 PassRefPtrWillBeRawPtr<RTCStatsResponseBase> RTCStatsRequestImpl::createResponse()
 {
     return RTCStatsResponse::create();
 }
 
 bool RTCStatsRequestImpl::hasSelector()
 {
     return m_component;
 }
 
 MediaStreamComponent* RTCStatsRequestImpl::component()
 {
     return m_component.get();
 }
 
 void RTCStatsRequestImpl::requestSucceeded(PassRefPtrWillBeRawPtr<RTCStatsResponseBase> response)
 {
     if (!m_successCallback)
         return;
-    m_successCallback->handleEvent(static_cast<RTCStatsResponse*>(response.get()));
+    if (m_requester && m_requester->requestCompletedCheckIfCallbackShouldFire())
+        m_successCallback->handleEvent(static_cast<RTCStatsResponse*>(response.get()));
     clear();
 }
 
 void RTCStatsRequestImpl::stop()
 {
+    if (m_requester)
+        m_requester->requestCompletedCheckIfCallbackShouldFire();
     clear();
 }
 
 void RTCStatsRequestImpl::clear()
 {
     m_successCallback.clear();
+    m_requester = 0;
 }
 
 } // namespace WebCore