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

Source/core/page/DOMWindowPagePopup.h

Index: Source/core/page/DOMWindowPagePopup.h
diff --git a/Source/core/page/DOMWindowPagePopup.h b/Source/core/page/DOMWindowPagePopup.h
index fb230213aff8c1cd37710f5f58dd3bf03ced12ab..58c673838e5726a07f57503840640c1fce2e6808 100644
--- a/Source/core/page/DOMWindowPagePopup.h
+++ b/Source/core/page/DOMWindowPagePopup.h
@@ -31,19 +31,19 @@
 #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);