Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/loader/cache/CachedDocument.cpp

 /*
     Copyright (C) 2010 Rob Buis <rwlbuis@gmail.com>
     Copyright (C) 2011 Cosmin Truta <ctruta@gmail.com>
     Copyright (C) 2012 University of Szeged
     Copyright (C) 2012 Renata Hodovan <reni@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 53 matching lines @@
         m_document = createDocument(response().url());
         m_document->setContent(decodedText.toString());
     }
     CachedResource::checkNotify();
 }
 
 PassRefPtr<Document> CachedDocument::createDocument(const KURL& url)
 {
     switch (type()) {
     case SVGDocumentResource:
-        return SVGDocument::create(0, url);
+        return SVGDocument::create(DocumentInitializer(url));
     default:
         // FIXME: We'll add more types to support HTMLImports.
         ASSERT_NOT_REACHED();
         return 0;
     }
 }
 
 void CachedDocument::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::CachedResourceSVG);
     CachedResource::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_document, "document");
     info.addMember(m_decoder, "decoder");
 }
 
 }