Oilpan: make DocumentFragment a heap allocated object.

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 96 matching lines @@
         return nullptr;
 
     String resultMIMEType;
     String resultString;
     String resultEncoding;
     if (!transformToString(sourceNode, resultMIMEType, resultString, resultEncoding))
         return nullptr;
     return createDocumentFromSource(resultString, resultEncoding, resultMIMEType, sourceNode, 0);
 }
 
-PassRefPtr<DocumentFragment> XSLTProcessor::transformToFragment(Node* sourceNode, Document* outputDoc)
+PassRefPtrWillBeRawPtr<DocumentFragment> XSLTProcessor::transformToFragment(Node* sourceNode, Document* outputDoc)
 {
     if (!sourceNode || !outputDoc)
         return nullptr;
 
     String resultMIMEType;
     String resultString;
     String resultEncoding;
 
     // If the output document is HTML, default to HTML method.
     if (outputDoc->isHTMLDocument())
@@ skipping 30 matching lines @@
     m_stylesheetRootNode.clear();
     m_parameters.clear();
 }
 
 void XSLTProcessor::trace(Visitor* visitor)
 {
     visitor->trace(m_stylesheet);
 }
 
 } // namespace WebCore