1 files changed, 1 insertions, 6 deletions
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index f8964d198..b029f9793 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -9642,13 +9642,8 @@ nsContentUtils::GetElementDefinitionIfObservingAttr(Element* aCustomElement,
                                                     nsIAtom* aExtensionType,
                                                     nsIAtom* aAttrName)
 {
-  nsString extType = nsDependentAtomString(aExtensionType);
-  NodeInfo *ni = aCustomElement->NodeInfo();
-
   CustomElementDefinition* definition =
-    LookupCustomElementDefinition(aCustomElement->OwnerDoc(), ni->LocalName(),
-                                  ni->NamespaceID(),
-                                  extType.IsEmpty() ? nullptr : &extType);
+    aCustomElement->GetCustomElementDefinition();
 
   // Custom element not defined yet or attribute is not in the observed
   // attribute list.