return clone->QueryInterface(kICSSDeclarationIID, (void**)&aClone);
return clone->QueryInterface(NS_GET_IID(nsICSSDeclaration), (void**)&aClone);
CSSDeclarationImpl::Clone(nsICSSDeclaration*& aClone) const{  CSSDeclarationImpl* clone = new CSSDeclarationImpl(*this);  if (clone) {    return clone->QueryInterface(kICSSDeclarationIID, (void**)&aClone);  }  aClone = nsnull;  return NS_ERROR_OUT_OF_MEMORY;}