Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/xml/XSLTProcessor.cpp

 /*
  * This file is part of the XSL implementation.
  *
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple, Inc. All rights reserved.
  * Copyright (C) 2005, 2006 Alexey Proskuryakov <ap@webkit.org>
  *
  * 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 86 matching lines @@
     data.setEncoding(sourceEncoding.isEmpty() ? UTF8Encoding() : WTF::TextEncoding(sourceEncoding));
     result->setEncodingData(data);
     result->setContent(documentSource);
 
     return result.release();
 }
 
 PassRefPtr<Document> XSLTProcessor::transformToDocument(Node* sourceNode)
 {
     if (!sourceNode)
-        return 0;
+        return nullptr;
 
     String resultMIMEType;
     String resultString;
     String resultEncoding;
     if (!transformToString(sourceNode, resultMIMEType, resultString, resultEncoding))
-        return 0;
+        return nullptr;
     return createDocumentFromSource(resultString, resultEncoding, resultMIMEType, sourceNode, 0);
 }
 
 PassRefPtr<DocumentFragment> XSLTProcessor::transformToFragment(Node* sourceNode, Document* outputDoc)
 {
     if (!sourceNode || !outputDoc)
-        return 0;
+        return nullptr;
 
     String resultMIMEType;
     String resultString;
     String resultEncoding;
 
     // If the output document is HTML, default to HTML method.
     if (outputDoc->isHTMLDocument())
         resultMIMEType = "text/html";
 
     if (!transformToString(sourceNode, resultMIMEType, resultString, resultEncoding))
-        return 0;
+        return nullptr;
     return createFragmentForTransformToFragment(resultString, resultMIMEType, *outputDoc);
 }
 
 void XSLTProcessor::setParameter(const String& /*namespaceURI*/, const String& localName, const String& value)
 {
     // FIXME: namespace support?
     // should make a QualifiedName here but we'd have to expose the impl
     m_parameters.set(localName, value);
 }
 
@@ skipping 11 matching lines @@
 }
 
 void XSLTProcessor::reset()
 {
     m_stylesheet.clear();
     m_stylesheetRootNode.clear();
     m_parameters.clear();
 }
 
 } // namespace WebCore