Have Node::document() return a reference instead of a pointer

Source/core/xml/XSLTProcessorLibxslt.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 208 matching lines @@
         fastFree((void*)*(temp++));
         fastFree((void*)*(temp++));
     }
     fastFree(params);
 }
 
 static xsltStylesheetPtr xsltStylesheetPointer(RefPtr<XSLStyleSheet>& cachedStylesheet, Node* stylesheetRootNode)
 {
     if (!cachedStylesheet && stylesheetRootNode) {
         cachedStylesheet = XSLStyleSheet::createForXSLTProcessor(stylesheetRootNode->parentNode() ? stylesheetRootNode->parentNode() : stylesheetRootNode,
-            stylesheetRootNode->document()->url().string(),
-            stylesheetRootNode->document()->url()); // FIXME: Should we use baseURL here?
+            stylesheetRootNode->document().url().string(),
+            stylesheetRootNode->document().url()); // FIXME: Should we use baseURL here?
 
         // According to Mozilla documentation, the node must be a Document node, an xsl:stylesheet or xsl:transform element.
         // But we just use text content regardless of node type.
         cachedStylesheet->parseString(createMarkup(stylesheetRootNode));
     }
 
     if (!cachedStylesheet || !cachedStylesheet->document())
         return 0;
 
     return cachedStylesheet->compileStyleSheet();
 }
 
 static inline xmlDocPtr xmlDocPtrFromNode(Node* sourceNode, bool& shouldDelete)
 {
-    RefPtr<Document> ownerDocument = sourceNode->document();
+    RefPtr<Document> ownerDocument = &sourceNode->document();
     bool sourceIsDocument = (sourceNode == ownerDocument.get());
 
     xmlDocPtr sourceDoc = 0;
     if (sourceIsDocument && ownerDocument->transformSource())
         sourceDoc = (xmlDocPtr)ownerDocument->transformSource()->platformSource();
     if (!sourceDoc) {
         sourceDoc = (xmlDocPtr)xmlDocPtrForString(ownerDocument->fetcher(), createMarkup(sourceNode),
             sourceIsDocument ? ownerDocument->url().string() : String());
         shouldDelete = sourceDoc;
     }
@@ skipping 14 matching lines @@
     if (xmlStrEqual(resultType, (const xmlChar*)"html"))
         return "text/html";
     if (xmlStrEqual(resultType, (const xmlChar*)"text"))
         return "text/plain";
 
     return "application/xml";
 }
 
 bool XSLTProcessor::transformToString(Node* sourceNode, String& mimeType, String& resultString, String& resultEncoding)
 {
-    RefPtr<Document> ownerDocument = sourceNode->document();
+    RefPtr<Document> ownerDocument = &sourceNode->document();
 
     setXSLTLoadCallBack(docLoaderFunc, this, ownerDocument->fetcher());
     xsltStylesheetPtr sheet = xsltStylesheetPointer(m_stylesheet, m_stylesheetRootNode.get());
     if (!sheet) {
         setXSLTLoadCallBack(0, 0, 0);
         m_stylesheet = 0;
         return false;
     }
     m_stylesheet->clearDocuments();
 
@@ skipping 50 matching lines @@
 
     sheet->method = origMethod;
     setXSLTLoadCallBack(0, 0, 0);
     xsltFreeStylesheet(sheet);
     m_stylesheet = 0;
 
     return success;
 }
 
 } // namespace WebCore