Implemented XMLSerializer in PrivateScript.

Source/core/xml/XMLSerializer.cpp

 /*
  *  Copyright (C) 2003, 2006 Apple Inc. All rights reserved.
  *  Copyright (C) 2006 Samuel Weinig (sam@webkit.org)
  *  Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
@@ skipping 10 matching lines @@
 #include "config.h"
 #include "core/xml/XMLSerializer.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/editing/MarkupAccumulator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-String XMLSerializer::serializeToString(Node* node, ExceptionState& exceptionState)
-{
-    if (!node) {
-        exceptionState.throwTypeError("Invalid node value.");
-        return String();
-    }
-
-    MarkupAccumulator accumulator(0, DoNotResolveURLs, nullptr, ForcedXML);
-    return accumulator.serializeNodes(*node, IncludeNode);
-}
-
 } // namespace blink