blink: Cleanup core class forward declarations

third_party/WebKit/Source/modules/csspaint/WindowPaintWorklet.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WindowPaintWorklet_h
 #define WindowPaintWorklet_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "modules/ModulesExport.h"
 #include "platform/Supplementable.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class DOMWindow;
+class LocalDOMWindow;
 class PaintWorklet;
 class Worklet;
 
 class MODULES_EXPORT WindowPaintWorklet final
     : public GarbageCollected<WindowPaintWorklet>,
       public Supplement<LocalDOMWindow>,
       public DOMWindowProperty {
   USING_GARBAGE_COLLECTED_MIXIN(WindowPaintWorklet);
 
  public:
   static WindowPaintWorklet& from(LocalDOMWindow&);
   static Worklet* paintWorklet(DOMWindow&);
   PaintWorklet* paintWorklet();
 
   DECLARE_TRACE();
 
  private:
   explicit WindowPaintWorklet(LocalDOMWindow&);
   static const char* supplementName();
 
   Member<PaintWorklet> m_paintWorklet;
 };
 
 }  // namespace blink
 
 #endif  // WindowPaintWorklet_h