Oilpan: IDBCursor should be detached from IDBRequest when the IDBRequest stops

Source/modules/indexeddb/IDBRequest.cpp

 /*
  * Copyright (C) 2010 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 370 matching lines @@
 
     if (m_readyState == PENDING) {
         m_readyState = EarlyDeath;
         if (m_transaction) {
             m_transaction->unregisterRequest(this);
             m_transaction.clear();
         }
     }
 
     m_enqueuedEvents.clear();
+    m_result.clear();
 }
 
 const AtomicString& IDBRequest::interfaceName() const
 {
     return EventTargetNames::IDBRequest;
 }
 
 ExecutionContext* IDBRequest::executionContext() const
 {
     return ActiveDOMObject::executionContext();
@@ skipping 120 matching lines @@
 
 void IDBRequest::dequeueEvent(Event* event)
 {
     for (size_t i = 0; i < m_enqueuedEvents.size(); ++i) {
         if (m_enqueuedEvents[i].get() == event)
             m_enqueuedEvents.remove(i);
     }
 }
 
 } // namespace WebCore