NS_NewURI(getter_AddRefs(mReferrerURI), nsLiteralString(aReferrer), nsnull);
NS_NewURI(getter_AddRefs(mReferrerURI), aReferrer, nsnull);
nsWebShell::SetReferrer(const PRUnichar* aReferrer){   NS_NewURI(getter_AddRefs(mReferrerURI), nsLiteralString(aReferrer), nsnull);}