Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderMarquee.h

 /*
  * Copyright (C) 2003 Apple Computer, Inc.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 87 matching lines @@
     int m_start;
     int m_end;
     int m_speed;
     Length m_height;
     bool m_reset: 1;
     bool m_suspended : 1;
     bool m_stopped : 1;
     EMarqueeDirection m_direction : 4;
 };
 
-inline RenderMarquee* toRenderMarquee(RenderObject* renderer)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!renderer || renderer->isMarquee());
-    return static_cast<RenderMarquee*>(renderer);
-}
-
-inline const RenderMarquee* toRenderMarquee(const RenderObject* renderer)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!renderer || renderer->isMarquee());
-    return static_cast<const RenderMarquee*>(renderer);
-}
-
-// Catch unneeded cast.
-void toRenderMarquee(const RenderMarquee*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderMarquee, isMarquee());
 
 } // namespace WebCore
 
 #endif // RenderMarquee_h