Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderCombineText.h

 /*
  * Copyright (C) 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 31 matching lines @@
     virtual float width(unsigned from, unsigned length, const Font&, float xPosition, HashSet<const SimpleFontData*>* fallbackFonts = 0, GlyphOverflow* = 0) const;
     virtual const char* renderName() const { return "RenderCombineText"; }
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
     virtual void setTextInternal(PassRefPtr<StringImpl>);
 
     float m_combinedTextWidth;
     bool m_isCombined : 1;
     bool m_needsFontUpdate : 1;
 };
 
-inline RenderCombineText* toRenderCombineText(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isCombineText());
-    return static_cast<RenderCombineText*>(object);
-}
-
-inline const RenderCombineText* toRenderCombineText(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isCombineText());
-    return static_cast<const RenderCombineText*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderCombineText(const RenderCombineText*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderCombineText, isCombineText());
 
 } // namespace WebCore
 
 #endif // RenderCombineText_h