Pass implementation object to supplemental classes by reference

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 20 matching lines @@
 
 namespace WebCore {
 
 class DOMWindow;
 class EntryCallback;
 class ErrorCallback;
 class FileSystemCallback;
 
 class DOMWindowFileSystem {
 public:
-    static void webkitRequestFileSystem(DOMWindow*, int type, long long size, PassOwnPtr<FileSystemCallback>, PassOwnPtr<ErrorCallback>);
-    static void webkitResolveLocalFileSystemURL(DOMWindow*, const String&, PassOwnPtr<EntryCallback>, PassOwnPtr<ErrorCallback>);
+    static void webkitRequestFileSystem(DOMWindow&, int type, long long size, PassOwnPtr<FileSystemCallback>, PassOwnPtr<ErrorCallback>);
+    static void webkitResolveLocalFileSystemURL(DOMWindow&, const String&, PassOwnPtr<EntryCallback>, PassOwnPtr<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 WebCore
 
 #endif // DOMWindowFileSystem_h