Minimize RenderObject* casting to RenderText*

Source/core/dom/Text.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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 19 matching lines @@
 class ExceptionState;
 class RenderText;
 
 class Text : public CharacterData {
 public:
     static const unsigned defaultLengthLimit = 1 << 16;
 
     static PassRefPtrWillBeRawPtr<Text> create(Document&, const String&);
     static PassRefPtrWillBeRawPtr<Text> createEditingText(Document&, const String&);
 
+    RenderText* renderer() const;
+
     // mergeNextSiblingNodesIfPossible() merges next sibling nodes if possible
     // then returns a node not merged.
     PassRefPtrWillBeRawPtr<Node> mergeNextSiblingNodesIfPossible();
     PassRefPtrWillBeRawPtr<Text> splitText(unsigned offset, ExceptionState&);
 
     // DOM Level 3: http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-1312295772
 
     String wholeText() const;
     PassRefPtrWillBeRawPtr<Text> replaceWholeText(const String&);
 
@@ skipping 27 matching lines @@
 #ifndef NDEBUG
     virtual void formatForDebugger(char* buffer, unsigned length) const OVERRIDE;
 #endif
 };
 
 DEFINE_NODE_TYPE_CASTS(Text, isTextNode());
 
 } // namespace blink
 
 #endif // Text_h