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

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 676 matching lines @@
     if (!s_pagePopupDriver)
         s_pagePopupDriver = MockPagePopupDriver::create(page->deprecatedLocalMainFrame()).leakPtr();
     page->chrome().client().setPagePopupDriver(s_pagePopupDriver);
 }
 
 PassRefPtrWillBeRawPtr<PagePopupController> Internals::pagePopupController()
 {
     return s_pagePopupDriver ? s_pagePopupDriver->pagePopupController() : 0;
 }
 
-LocalDOMWindow* Internals::pagePopupWindow() const
+DOMWindow* Internals::pagePopupWindow() const
 {
     Document* document = contextDocument();
     if (!document)
         return nullptr;
     Page* page = document->page();
     if (!page)
         return nullptr;
     PagePopupDriver* pagePopupDriver = page->chrome().client().pagePopupDriver();
     if (!pagePopupDriver)
         return nullptr;
@@ skipping 1589 matching lines @@
     }
     toHTMLPlugInElement(element)->setPlaceholder(DictionaryPluginPlaceholder::create(element->document(), options));
 }
 
 Iterator* Internals::iterator(ScriptState* scriptState, ExceptionState& exceptionState)
 {
     return new InternalsIterator;
 }
 
 } // namespace blink