Refactoring: Have StyledMarkupAccumulator use MarkupFormatter

Source/core/editing/MarkupAccumulator.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
 public:
     MarkupAccumulator(EAbsoluteURLs, SerializationType = SerializationType::AsOwnerDocument);
     virtual ~MarkupAccumulator();
 
     void appendString(const String&);
     virtual void appendStartTag(Node&, Namespaces* = nullptr);
     virtual void appendEndTag(const Element&);
     void appendStartMarkup(StringBuilder&, Node&, Namespaces*);
     void appendEndMarkup(StringBuilder&, const Element&);
 
-    size_t length() const { return m_markup.length(); }
-    void concatenateMarkup(StringBuilder&) const;
-
     bool serializeAsHTMLDocument(const Node&) const;
     String toString() { return m_markup.toString(); }
 
     virtual void appendCustomAttributes(StringBuilder&, const Element&, Namespaces*);
 
     virtual void appendText(StringBuilder&, Text&);
     virtual bool shouldIgnoreAttribute(const Attribute&);
     virtual void appendElement(StringBuilder&, Element&, Namespaces*);
     void appendOpenTag(StringBuilder&, const Element&, Namespaces*);
     void appendCloseTag(StringBuilder&, const Element&);
     void appendAttribute(StringBuilder&, const Element&, const Attribute&, Namespaces*);
 
     EntityMask entityMaskForText(const Text&) const;
 
 private:
     MarkupFormatter m_formatter;
     StringBuilder m_markup;
 };
 
 template<typename Strategy>
 String serializeNodes(MarkupAccumulator&, Node&, EChildrenOnly);
 
 extern template String serializeNodes<EditingStrategy>(MarkupAccumulator&, Node&, EChildrenOnly);
 
 }
 
 #endif