nsCOMPtr<nsIStyleRule> impRule = getter_AddRefs(cssRule->GetImportantRule());
nsCOMPtr<nsIStyleRule> impRule = cssRule->GetImportantRule();
StyleSetImpl::AddImportantRules(nsRuleNode* aCurrLevelNode,                                nsRuleNode* aLastPrevLevelNode){  if (!aCurrLevelNode || aCurrLevelNode == aLastPrevLevelNode)    return;  AddImportantRules(aCurrLevelNode->GetParent(), aLastPrevLevelNode);  nsCOMPtr<nsIStyleRule> rule;;  aCurrLevelNode->GetRule(getter_AddRefs(rule));  nsCOMPtr<nsICSSStyleRule> cssRule(do_QueryInterface(rule));  if (cssRule) {    nsCOMPtr<nsIStyleRule> impRule = getter_AddRefs(cssRule->GetImportantRule());    if (impRule)      mRuleWalker->Forward(impRule);  }}