Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderText.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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.
  *
@@ skipping 206 matching lines @@
 }
 
 inline UChar RenderText::characterAt(unsigned i) const
 {
     if (i >= textLength())
         return 0;
 
     return uncheckedCharacterAt(i);
 }
 
-inline RenderText* toRenderText(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isText());
-    return static_cast<RenderText*>(object);
-}
-
-inline const RenderText* toRenderText(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isText());
-    return static_cast<const RenderText*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderText(const RenderText*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderText, isText());
 
 #ifdef NDEBUG
 inline void RenderText::checkConsistency() const
 {
 }
 #endif
 
 void applyTextTransform(const RenderStyle*, String&, UChar);
 
 } // namespace WebCore
 
 #endif // RenderText_h