Introduce DEFINE_INLINE_BOX_TYPE_CASTS, and use it

Source/core/rendering/InlineBox.h

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 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
  * 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 406 matching lines @@
 }
 #endif
 
 #ifndef NDEBUG
 inline void InlineBox::setHasBadParent()
 {
     m_hasBadParent = true;
 }
 #endif
 
+#define DEFINE_INLINE_BOX_TYPE_CASTS(typeName) \
+    DEFINE_TYPE_CASTS(typeName, InlineBox, box, box->is##typeName(), box.is##typeName())
+
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::InlineBox*);
 void showLineTree(const WebCore::InlineBox*);
 #endif
 
 #endif // InlineBox_h