Use default argument value instead of overloading for MarkupAccumulator::serializeNodes()

Source/core/editing/MarkupAccumulator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010 Google 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
@@ skipping 93 matching lines @@
     : m_nodes(nodes)
     , m_range(range)
     , m_resolveURLsMethod(resolveUrlsMethod)
 {
 }
 
 MarkupAccumulator::~MarkupAccumulator()
 {
 }
 
-String MarkupAccumulator::serializeNodes(Node* targetNode, EChildrenOnly childrenOnly)
-{
-    return serializeNodes(targetNode, childrenOnly, 0);
-}
-
 String MarkupAccumulator::serializeNodes(Node* targetNode, EChildrenOnly childrenOnly, Vector<QualifiedName>* tagNamesToSkip)
 {
     serializeNodesWithNamespaces(targetNode, childrenOnly, 0, tagNamesToSkip);
     return m_markup.toString();
 }
 
 void MarkupAccumulator::serializeNodesWithNamespaces(Node* targetNode, EChildrenOnly childrenOnly, const Namespaces* namespaces, Vector<QualifiedName>* tagNamesToSkip)
 {
     if (tagNamesToSkip) {
         for (size_t i = 0; i < tagNamesToSkip->size(); ++i) {
@@ skipping 419 matching lines @@
     if (!node->isElementNode() || shouldSelfClose(node) || (!node->hasChildNodes() && elementCannotHaveEndTag(node)))
         return;
 
     result.append('<');
     result.append('/');
     result.append(toElement(node)->nodeNamePreservingCase());
     result.append('>');
 }
 
 }