Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderTableCell.h

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009 Apple 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
@@ skipping 269 matching lines @@
 
     // Note MSVC will only pack members if they have identical types, hence we use unsigned instead of bool here.
     unsigned m_column : 29;
     unsigned m_cellWidthChanged : 1;
     unsigned m_hasColSpan: 1;
     unsigned m_hasRowSpan: 1;
     int m_intrinsicPaddingBefore;
     int m_intrinsicPaddingAfter;
 };
 
-inline RenderTableCell* toRenderTableCell(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
-    return static_cast<RenderTableCell*>(object);
-}
-
-inline const RenderTableCell* toRenderTableCell(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCell());
-    return static_cast<const RenderTableCell*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderTableCell(const RenderTableCell*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCell, isTableCell());
 
 } // namespace WebCore
 
 #endif // RenderTableCell_h