Bug 1460334 - Fix crash caused when attempting to migrate <deck> from a XBL binding to a Custom Element. r=peterv

--HG--
extra : amend_source : 461d41fa51087ce1cefc72df61a00e9cae5605e5

dom/base/CustomElementRegistry.cpp

@@ -1230,7 +1230,7 @@ CustomElementReactionsStack::InvokeReactions(ElementQueue* aElementQueue,
     MOZ_ASSERT(element);
 
     RefPtr<CustomElementData> elementData = element->GetCustomElementData();
-    if (!elementData) {
+    if (!elementData || !element->GetOwnerGlobal()) {
       // This happens when the document is destroyed and the element is already
       // unlinked, no need to fire the callbacks in this case.
       continue;