Devirtualize Frame::domWindow().

third_party/WebKit/Source/core/frame/RemoteDOMWindow.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef RemoteDOMWindow_h
 #define RemoteDOMWindow_h
 
 #include "core/frame/DOMWindow.h"
 #include "core/frame/RemoteFrame.h"
+#include "wtf/Assertions.h"
 
 namespace blink {
 
 class RemoteDOMWindow final : public DOMWindow {
  public:
   static RemoteDOMWindow* create(RemoteFrame& frame) {
     return new RemoteDOMWindow(frame);
   }
 
   // EventTarget overrides:
@@ skipping 82 matching lines @@
   explicit RemoteDOMWindow(RemoteFrame&);
 
   // Intentionally private to prevent redundant checks when the type is
   // already RemoteDOMWindow.
   bool isLocalDOMWindow() const override { return false; }
   bool isRemoteDOMWindow() const override { return true; }
 
   Member<RemoteFrame> m_frame;
 };
 
+DEFINE_TYPE_CASTS(RemoteDOMWindow,
+                  DOMWindow,
+                  x,
+                  x->isRemoteDOMWindow(),
+                  x.isRemoteDOMWindow());
+
 }  // namespace blink
 
 #endif  // DOMWindow_h