Introduce DEFINE_INLINE_BOX_TYPE_CASTS, and use it

Source/core/rendering/InlineFlowBox.h

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007 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 332 matching lines @@
     unsigned m_lineBreakBidiStatusLast : 5; // WTF::Unicode::Direction
 
     // End of RootInlineBox-specific members.
 
 #ifndef NDEBUG
 private:
     unsigned m_hasBadChildList : 1;
 #endif
 };
 
-inline InlineFlowBox* toInlineFlowBox(InlineBox* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isInlineFlowBox());
-    return static_cast<InlineFlowBox*>(object);
-}
-
-inline const InlineFlowBox* toInlineFlowBox(const InlineBox* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isInlineFlowBox());
-    return static_cast<const InlineFlowBox*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toInlineFlowBox(const InlineFlowBox*);
+DEFINE_INLINE_BOX_TYPE_CASTS(InlineFlowBox);
 
 #ifdef NDEBUG
 inline void InlineFlowBox::checkConsistency() const
 {
 }
 #endif
 
 inline void InlineFlowBox::setHasBadChildList()
 {
 #ifndef NDEBUG
     m_hasBadChildList = true;
 #endif
 }
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const WebCore::InlineFlowBox*);
 #endif
 
 #endif // InlineFlowBox_h