Bug 1565584: move nsIContentUtils::ContentIsDescendantOf to nsINode::IsInclusiveDescendantOf. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D37880

dom/html/HTMLSelectElement.cpp

@@ -533,7 +533,7 @@ void HTMLSelectElement::Add(nsGenericHTMLElement& aElement,
   // Just in case we're not the parent, get the parent of the reference
   // element
   nsCOMPtr<nsINode> parent = aBefore->Element::GetParentNode();
-  if (!parent || !nsContentUtils::ContentIsDescendantOf(parent, this)) {
+  if (!parent || !parent->IsInclusiveDescendantOf(this)) {
     // NOT_FOUND_ERR: Raised if before is not a descendant of the SELECT
     // element.
     aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);