CSSStyleSheetImpl* clone = new CSSStyleSheetImpl(*this);
NS_PRECONDITION(aClone, "Null out param!"); CSSStyleSheetImpl* clone = new CSSStyleSheetImpl(*this, aCloneParent, aCloneOwnerRule, aCloneDocument, aCloneOwningNode);
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;}