Bug 1452615 - Reduce unneeded AddRefing/Releasing when unregistering unresolved custom elements, r=emilio

--HG--
extra : rebase_source : e459aee935cf18fd2bda03a5ebe420b5288c8e9c

dom/base/nsContentUtils.cpp

@@ -10140,7 +10140,7 @@ nsContentUtils::UnregisterUnresolvedElement(Element* aElement)
 {
   MOZ_ASSERT(aElement);
 
-  RefPtr<nsAtom> typeAtom =
+  nsAtom* typeAtom =
     aElement->GetCustomElementData()->GetCustomElementType();
   nsIDocument* doc = aElement->OwnerDoc();
   nsPIDOMWindowInner* window(doc->GetInnerWindow());
@@ -10148,7 +10148,7 @@ nsContentUtils::UnregisterUnresolvedElement(Element* aElement)
     return;
   }
 
-  RefPtr<CustomElementRegistry> registry(window->CustomElements());
+  CustomElementRegistry* registry = window->CustomElements();
   if (!registry) {
     return;
   }