Have ChildFrameDisconnector / ChildListMutationScope deal with references

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index dcc525a5e8b869143f617ac65f55e063a2d58e35..41c734aa68083ac7e8da55ccc916ff6d1dcdfd13 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -2932,7 +2932,7 @@ void Element::willModifyAttribute(const QualifiedName& name, const AtomicString&
             CustomElement::attributeDidChange(this, name.localName(), oldValue, newValue);
     }
 
-    if (OwnPtr<MutationObserverInterestGroup> recipients = MutationObserverInterestGroup::createForAttributesMutation(this, name))
+    if (OwnPtr<MutationObserverInterestGroup> recipients = MutationObserverInterestGroup::createForAttributesMutation(*this, name))
         recipients->enqueueMutationRecord(MutationRecord::createAttributes(this, name, oldValue));
 
     InspectorInstrumentation::willModifyDOMAttr(this, oldValue, newValue);