Fix issue of localDescription and remoteDescription getter.

Source/modules/mediastream/RTCSessionDescriptionRequestImpl.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
@@ skipping 35 matching lines @@
     RTCSessionDescriptionRequestImpl* request = new RTCSessionDescriptionRequestImpl(context, requester, successCallback, errorCallback);
     request->suspendIfNeeded();
     return request;
 }
 
 RTCSessionDescriptionRequestImpl::RTCSessionDescriptionRequestImpl(ExecutionContext* context, RTCPeerConnection* requester, RTCSessionDescriptionCallback* successCallback, RTCErrorCallback* errorCallback)
     : ActiveDOMObject(context)
     , m_successCallback(successCallback)
     , m_errorCallback(errorCallback)
     , m_requester(requester)
+    , m_context(context)
 {
     ASSERT(m_requester);
 }
 
 RTCSessionDescriptionRequestImpl::~RTCSessionDescriptionRequestImpl()
 {
 }
 
 void RTCSessionDescriptionRequestImpl::requestSucceeded(const WebRTCSessionDescription& webSessionDescription)
 {
     bool shouldFireCallback = m_requester ? m_requester->shouldFireDefaultCallbacks() : false;
     if (shouldFireCallback && m_successCallback)
-        m_successCallback->handleEvent(RTCSessionDescription::create(webSessionDescription));
+        m_successCallback->handleEvent(RTCSessionDescription::create(m_context, webSessionDescription));
     clear();
 }
 
 void RTCSessionDescriptionRequestImpl::requestFailed(const String& error)
 {
     bool shouldFireCallback = m_requester ? m_requester->shouldFireDefaultCallbacks() : false;
     if (shouldFireCallback && m_errorCallback)
         m_errorCallback->handleEvent(error);
 
     clear();
@@ skipping 14 matching lines @@
 DEFINE_TRACE(RTCSessionDescriptionRequestImpl)
 {
     visitor->trace(m_successCallback);
     visitor->trace(m_errorCallback);
     visitor->trace(m_requester);
     RTCSessionDescriptionRequest::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink