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

Source/modules/webdatabase/DOMWindowWebDatabase.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 14 matching lines @@
  */
 
 #ifndef DOMWindowWebDatabase_h
 #define DOMWindowWebDatabase_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
-class LocalDOMWindow;
+class DOMWindow;
 class Database;
 class DatabaseCallback;
 class ExceptionState;
 
 class DOMWindowWebDatabase {
 public:
-    static Database* openDatabase(LocalDOMWindow&, const String& name, const String& version, const String& displayName, unsigned long estimatedSize, DatabaseCallback* creationCallback, ExceptionState&);
+    static Database* openDatabase(DOMWindow&, const String& name, const String& version, const String& displayName, unsigned long estimatedSize, DatabaseCallback* creationCallback, ExceptionState&);
 
 private:
     DOMWindowWebDatabase() { };
     ~DOMWindowWebDatabase() { };
 };
 
 } // namespace blink
 
 #endif // DOMWindowWebDatabase_h