*aNotificationCallbacks = nsnull;
NS_ENSURE_ARG_POINTER(aNotificationCallbacks); *aNotificationCallbacks = mCallbacks; NS_IF_ADDREF(*aNotificationCallbacks);
NS_IMETHODIMP nsExtProtocolChannel::GetNotificationCallbacks(nsIInterfaceRequestor* *aNotificationCallbacks){  *aNotificationCallbacks = nsnull;  return NS_OK;}