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

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 651c71e077db1b24b0e714332a33a468b443e6ad..6b28273fe28db3be56ca4667eb13681d64d76622 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -691,8 +691,6 @@ public:
 
     void setDOMWindow(DOMWindow* domWindow) { m_domWindow = domWindow; }
     DOMWindow* domWindow() const { return m_domWindow; }
-    // In DOM Level 2, the Document's DOMWindow is called the defaultView.
-    DOMWindow* defaultView() const { return domWindow(); }
 
     // Helper functions for forwarding DOMWindow event related tasks to the DOMWindow if it exists.
     void setWindowAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, DOMWrapperWorld* isolatedWorld = 0);