mStatus = status; mMessage = (PRUnichar*)aMsg;
mSourceOffset = aSourceOffset; mLength = aLength; mIStream = aIStream; NS_ADDREF(mIStream);
nsOnStopRequestEvent::Init(nsresult status, const PRUnichar* aMsg){    mStatus = status;    mMessage = (PRUnichar*)aMsg;    return NS_OK;}