Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderDetailsMarker.h

 /*
  * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 26 matching lines @@
     virtual const char* renderName() const { return "RenderDetailsMarker"; }
     virtual bool supportsPartialLayout() const OVERRIDE { return false; }
     virtual bool isDetailsMarker() const { return true; }
     virtual void paint(PaintInfo&, const LayoutPoint&);
 
     bool isOpen() const;
     Path getCanonicalPath() const;
     Path getPath(const LayoutPoint& origin) const;
 };
 
-inline RenderDetailsMarker* toRenderDetailsMarker(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isDetailsMarker());
-    return static_cast<RenderDetailsMarker*>(object);
-}
-
-inline const RenderDetailsMarker* toRenderDetailsMarker(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isDetailsMarker());
-    return static_cast<const RenderDetailsMarker*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderDetailsMarker(const RenderDetailsMarker*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderDetailsMarker, isDetailsMarker());
 
 }
 
 #endif // RenderDetailsMarker_h