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

Source/modules/indexeddb/DOMWindowIndexedDatabase.h

 /*
  * Copyright (C) 2011, 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 15 matching lines @@
 #ifndef DOMWindowIndexedDatabase_h
 #define DOMWindowIndexedDatabase_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/indexeddb/IndexedDBClient.h"
 #include "platform/Supplementable.h"
 
 namespace blink {
 
 class IDBFactory;
-class LocalDOMWindow;
+class DOMWindow;
 
 class DOMWindowIndexedDatabase final : public NoBaseWillBeGarbageCollected<DOMWindowIndexedDatabase>, public WillBeHeapSupplement<LocalDOMWindow>, public DOMWindowProperty {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(DOMWindowIndexedDatabase);
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(DOMWindowIndexedDatabase);
 public:
     static DOMWindowIndexedDatabase& from(LocalDOMWindow&);
 
-    static IDBFactory* indexedDB(LocalDOMWindow&);
+    static IDBFactory* indexedDB(DOMWindow&);
 
     virtual void willDestroyGlobalObjectInFrame() override;
     virtual void willDetachGlobalObjectFromFrame() override;
 
     void trace(Visitor*);
 
 private:
     explicit DOMWindowIndexedDatabase(LocalDOMWindow&);
 
     IDBFactory* indexedDB();
     static const char* supplementName();
 
     LocalDOMWindow& m_window;
     PersistentWillBeMember<IDBFactory> m_idbFactory;
 };
 
 } // namespace blink
 
 #endif // DOMWindowIndexedDatabase_h