Remove unnecessary includes from LayoutBox.h, LayoutBoxModelObject.h and LayoutObject.h

third_party/WebKit/Source/core/layout/LayoutBoxModelObject.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 10 matching lines @@
  *
  */
 
 #ifndef LayoutBoxModelObject_h
 #define LayoutBoxModelObject_h
 
 #include "core/CoreExport.h"
 #include "core/layout/BackgroundBleedAvoidance.h"
 #include "core/layout/LayoutObject.h"
 #include "core/page/scrolling/StickyPositionScrollingConstraints.h"
-#include "core/style/ShadowData.h"
 #include "platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 class LineLayoutBoxModel;
 class PaintLayer;
 class PaintLayerScrollableArea;
 
 enum PaintLayerType {
     NoPaintLayer,
@@ skipping 346 matching lines @@
     OwnPtr<PaintLayer> m_layer;
 
     OwnPtr<LayoutBoxModelObjectRareData> m_rareData;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBoxModelObject, isBoxModelObject());
 
 } // namespace blink
 
 #endif // LayoutBoxModelObject_h