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