nsAsyncStreamObserver(nsIEventQueue* aEventQ) : mReceiver(nsnull), mStatus(NS_OK)
nsAsyncStreamObserver() : mStatus(NS_OK)
    nsAsyncStreamObserver(nsIEventQueue* aEventQ)         : mReceiver(nsnull), mStatus(NS_OK)     {         NS_INIT_REFCNT();        mEventQueue = aEventQ;        NS_IF_ADDREF(mEventQueue);    }