Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderBoxModelObject.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 314 matching lines @@
     void paintTranslucentBorderSides(GraphicsContext*, const RenderStyle*, const RoundedRect& outerBorder, const RoundedRect& innerBorder, const IntPoint& innerBorderAdjustment,
         const class BorderEdge[], BorderEdgeFlags, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias = false);
     void paintBorderSides(GraphicsContext*, const RenderStyle*, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
         const IntPoint& innerBorderAdjustment, const class BorderEdge[], BorderEdgeFlags, BackgroundBleedAvoidance,
         bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias = false, const Color* overrideColor = 0);
     void drawBoxSideFromPath(GraphicsContext*, const LayoutRect&, const Path&, const class BorderEdge[],
                             float thickness, float drawThickness, BoxSide, const RenderStyle*,
                             Color, EBorderStyle, BackgroundBleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge);
 };
 
-inline RenderBoxModelObject* toRenderBoxModelObject(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBoxModelObject());
-    return static_cast<RenderBoxModelObject*>(object);
-}
-
-inline const RenderBoxModelObject* toRenderBoxModelObject(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isBoxModelObject());
-    return static_cast<const RenderBoxModelObject*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderBoxModelObject(const RenderBoxModelObject*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBoxModelObject, isBoxModelObject());
 
 } // namespace WebCore
 
 #endif // RenderBoxModelObject_h