Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderNamedFlowThread.h

 /*
  * Copyright (C) 2012 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 118 matching lines @@
 
     bool m_overset : 1;
 
     // The DOM Object that represents a named flow.
     RefPtr<NamedFlow> m_namedFlow;
 
     Timer<RenderNamedFlowThread> m_regionLayoutUpdateEventTimer;
     Timer<RenderNamedFlowThread> m_regionOversetChangeEventTimer;
 };
 
-inline RenderNamedFlowThread* toRenderNamedFlowThread(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderNamedFlowThread());
-    return static_cast<RenderNamedFlowThread*>(object);
-}
-
-inline const RenderNamedFlowThread* toRenderNamedFlowThread(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isRenderNamedFlowThread());
-    return static_cast<const RenderNamedFlowThread*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderNamedFlowThread(const RenderNamedFlowThread*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderNamedFlowThread, isRenderNamedFlowThread());
 
 } // namespace WebCore
 
 #endif // RenderNamedFlowThread_h