rv = serv->NewChannelFromURI("load", uri, aGroup, eventSinkGetter, nsnull, &channel);
rv = serv->NewChannelFromURI("load", uri, aGroup, notificationCallbacks, loadAttributes, nsnull, &channel);
NS_OpenURI(nsIChannel* *result, nsIURI* uri, nsILoadGroup *aGroup,           nsIEventSinkGetter *eventSinkGetter){    nsresult rv;    NS_WITH_SERVICE(nsIIOService, serv, kIOServiceCID, &rv);    if (NS_FAILED(rv)) return rv;    nsIChannel* channel;    rv = serv->NewChannelFromURI("load", uri, aGroup, eventSinkGetter,                                  nsnull, &channel);    if (NS_FAILED(rv)) return rv;    *result = channel;    return rv;}