Use [ImplementedAs=domWindow] for Document.defaultView()

Source/core/dom/custom/CustomElement.cpp

Index: Source/core/dom/custom/CustomElement.cpp
diff --git a/Source/core/dom/custom/CustomElement.cpp b/Source/core/dom/custom/CustomElement.cpp
index f33e612c14ece65b1f2e32be78c5f04e4134cec5..a2a150cc0d57e7c56f0dcd2b9e9b980c99114a42 100644
--- a/Source/core/dom/custom/CustomElement.cpp
+++ b/Source/core/dom/custom/CustomElement.cpp
@@ -135,7 +135,7 @@ void CustomElement::attributeDidChange(Element* element, const AtomicString& nam
 void CustomElement::didEnterDocument(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
-    if (!document.defaultView())
+    if (!document.domWindow())
         return;
     CustomElementCallbackScheduler::scheduleEnteredViewCallback(definitionFor(element)->callbacks(), element);
 }
@@ -143,7 +143,7 @@ void CustomElement::didEnterDocument(Element* element, const Document& document)
 void CustomElement::didLeaveDocument(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
-    if (!document.defaultView())
+    if (!document.domWindow())
         return;
     CustomElementCallbackScheduler::scheduleLeftViewCallback(definitionFor(element)->callbacks(), element);
 }