blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/paint/ViewPainter.h

 // Copyright 2014 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 ViewPainter_h
 #define ViewPainter_h
 
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class LayoutPoint;
 struct PaintInfo;
-class LayoutBox;
 class LayoutView;
 
 class ViewPainter {
   STACK_ALLOCATED();
 
  public:
   ViewPainter(const LayoutView& layoutView) : m_layoutView(layoutView) {}
 
   void paint(const PaintInfo&, const LayoutPoint& paintOffset);
   void paintBoxDecorationBackground(const PaintInfo&);
 
  private:
   const LayoutView& m_layoutView;
 };
 
 }  // namespace blink
 
 #endif  // ViewPainter_h