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

Source/modules/filesystem/DOMWindowFileSystem.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:
  *
  * 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 13 matching lines @@
  */
 
 #ifndef DOMWindowFileSystem_h
 #define DOMWindowFileSystem_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class LocalDOMWindow;
+class DOMWindow;
 class EntryCallback;
 class ErrorCallback;
 class FileSystemCallback;
 
 class DOMWindowFileSystem {
 public:
-    static void webkitRequestFileSystem(LocalDOMWindow&, int type, long long size, FileSystemCallback*, ErrorCallback*);
-    static void webkitResolveLocalFileSystemURL(LocalDOMWindow&, const String&, EntryCallback*, ErrorCallback*);
+    static void webkitRequestFileSystem(DOMWindow&, int type, long long size, FileSystemCallback*, ErrorCallback*);
+    static void webkitResolveLocalFileSystemURL(DOMWindow&, const String&, EntryCallback*, ErrorCallback*);
 
     // They are placed here and in all capital letters so they can be checked against the constants in the
     // IDL at compile time.
     enum {
         TEMPORARY,
         PERSISTENT,
     };
 
 private:
     DOMWindowFileSystem();
     ~DOMWindowFileSystem();
 };
 
 } // namespace blink
 
 #endif // DOMWindowFileSystem_h