aClone = (nsICSSStyleSheet*)clone; NS_ADDREF(aClone);
*aClone = NS_STATIC_CAST(nsICSSStyleSheet*, clone); NS_ADDREF(*aClone);
CSSStyleSheetImpl::Clone(nsICSSStyleSheet*& aClone) const{  // XXX no, really need to clone  CSSStyleSheetImpl* clone = new CSSStyleSheetImpl(*this);  if (clone) {    aClone = (nsICSSStyleSheet*)clone;    NS_ADDREF(aClone);  }  return NS_OK;}