rv = ioService->NewURI(spec, nsnull, baseURI, result);
rv = ioService->NewURI(nsDependentCString(spec), nsnull, baseURI, result);
NS_NewURI(nsIURI* *result,           const char* spec,           nsIURI* baseURI = nsnull)     // pass in nsIIOService to optimize callers{    nsIIOService* ioService;    static NS_DEFINE_CID(kIOServiceCID, NS_IOSERVICE_CID);    nsresult rv = theServiceManager->GetService(kIOServiceCID, NS_GET_IID(nsIIOService), (void**)&ioService);    if (rv == NS_OK)        rv = ioService->NewURI(spec, nsnull, baseURI, result);    NS_RELEASE(ioService);    return rv;}