CSSImportRuleImpl::Clone(nsICSSRule*& aClone) const
CSSCharsetRuleImpl::Clone(nsICSSRule*& aClone) const
CSSImportRuleImpl::Clone(nsICSSRule*& aClone) const{  CSSImportRuleImpl* clone = new CSSImportRuleImpl(*this);  if (clone) {    return clone->QueryInterface(kICSSRuleIID, (void **)&aClone);  }  aClone = nsnull;  return NS_ERROR_OUT_OF_MEMORY;}