Extract a DOMWindow interface from LocalDOMWindow and use it in the idl.

Source/core/page/DOMWindowPagePopup.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMWindowPagePopup_h
 #define DOMWindowPagePopup_h
 
+#include "core/frame/LocalDOMWindow.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
-class LocalDOMWindow;
 class PagePopupClient;
 class PagePopupController;
 
 class DOMWindowPagePopup final : public NoBaseWillBeGarbageCollected<DOMWindowPagePopup>, public WillBeHeapSupplement<LocalDOMWindow> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowPagePopup);
 public:
-    static PagePopupController* pagePopupController(LocalDOMWindow&);
+    static PagePopupController* pagePopupController(DOMWindow&);
     static void install(LocalDOMWindow&, PagePopupClient*);
     static void uninstall(LocalDOMWindow&);
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowPagePopup);
 
     void trace(Visitor*);
 
 private:
     explicit DOMWindowPagePopup(PagePopupClient*);
     static const char* supplementName();
 
     RefPtrWillBeMember<PagePopupController> m_controller;
 };
 
 }
 #endif