Avoid referencing an HTMLMediaElement if is currently being deleted

Source/core/dom/GenericEventQueue.cpp

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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
@@ skipping 34 matching lines @@
 
 GenericEventQueue::~GenericEventQueue()
 {
 }
 
 bool GenericEventQueue::enqueueEvent(PassRefPtr<Event> event)
 {
     if (m_isClosed)
         return false;
 
-    ASSERT(event->target());
     if (event->target() == m_owner)
         event->setTarget(0);
 
     m_pendingEvents.append(event);
 
     if (!m_timer.isActive())
         m_timer.startOneShot(0);
 
     return true;
 }
@@ skipping 39 matching lines @@
     m_timer.stop();
     m_pendingEvents.clear();
 }
 
 bool GenericEventQueue::hasPendingEvents() const
 {
     return m_pendingEvents.size();
 }
 
 }