Remove MarkupAccumulator::appendNodeValue() method

Source/core/dom/CharacterData.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 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 15 matching lines @@
 #include "core/dom/Node.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ExceptionState;
 
 class CharacterData : public Node {
 public:
     void atomize();
-    String data() const { return m_data; }
+    const String& data() const { return m_data; }
     void setData(const String&);
     unsigned length() const { return m_data.length(); }
     String substringData(unsigned offset, unsigned count, ExceptionState&);
     void appendData(const String&);
     void replaceData(unsigned offset, unsigned count, const String&, ExceptionState&);
 
     enum RecalcStyleBehavior { DoNotRecalcStyle, DeprecatedRecalcStyleImmediatlelyForEditing };
     void insertData(unsigned offset, const String&, ExceptionState&, RecalcStyleBehavior = DoNotRecalcStyle);
     void deleteData(unsigned offset, unsigned count, ExceptionState&, RecalcStyleBehavior = DoNotRecalcStyle);
 
@@ skipping 28 matching lines @@
     virtual int maxCharacterOffset() const OVERRIDE FINAL;
     virtual bool offsetInCharacters() const OVERRIDE FINAL;
     void setDataAndUpdate(const String&, unsigned offsetOfReplacedData, unsigned oldLength, unsigned newLength, RecalcStyleBehavior = DoNotRecalcStyle);
 };
 
 DEFINE_NODE_TYPE_CASTS(CharacterData, isCharacterDataNode());
 
 } // namespace WebCore
 
 #endif // CharacterData_h