blink: Cleanup core class forward declarations

third_party/WebKit/Source/modules/crypto/DOMWindowCrypto.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define DOMWindowCrypto_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Crypto;
 class DOMWindow;
+class LocalDOMWindow;
 
 class DOMWindowCrypto final : public GarbageCollected<DOMWindowCrypto>,
                               public Supplement<LocalDOMWindow>,
                               public DOMWindowProperty {
   USING_GARBAGE_COLLECTED_MIXIN(DOMWindowCrypto);
 
  public:
   static DOMWindowCrypto& from(LocalDOMWindow&);
   static Crypto* crypto(DOMWindow&);
   Crypto* crypto() const;
 
   DECLARE_TRACE();
 
  private:
   explicit DOMWindowCrypto(LocalDOMWindow&);
   static const char* supplementName();
 
   mutable Member<Crypto> m_crypto;
 };
 
 }  // namespace blink
 
 #endif  // DOMWindowCrypto_h