Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderGrid.h

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 139 matching lines @@
     typedef Vector<Vector<GridCell> > GridRepresentation;
     GridRepresentation m_grid;
     bool m_gridIsDirty;
     Vector<LayoutUnit> m_rowPositions;
     Vector<LayoutUnit> m_columnPositions;
     HashMap<const RenderBox*, GridCoordinate> m_gridItemCoordinate;
     OrderIterator m_orderIterator;
     bool m_gridItemOverflowGridArea;
 };
 
-inline RenderGrid* toRenderGrid(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderGrid());
-    return static_cast<RenderGrid*>(object);
-}
-
-inline const RenderGrid* toRenderGrid(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderGrid());
-    return static_cast<const RenderGrid*>(object);
-}
-
-// Catch unneeded cast.
-void toRenderGrid(const RenderGrid*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderGrid, isRenderGrid());
 
 } // namespace WebCore
 
 #endif // RenderGrid_h