Oilpan: Replace RefPtrs to Document in core/{accessibility,animation,fetch} with Oilpan transition …

Source/core/fetch/DocumentResource.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 47 matching lines @@
         StringBuilder decodedText;
         decodedText.append(m_decoder->decode(m_data->data(), m_data->size()));
         decodedText.append(m_decoder->flush());
         // We don't need to create a new frame because the new document belongs to the parent UseElement.
         m_document = createDocument(response().url());
         m_document->setContent(decodedText.toString());
     }
     Resource::checkNotify();
 }
 
-PassRefPtr<Document> DocumentResource::createDocument(const KURL& url)
+PassRefPtrWillBeRawPtr<Document> DocumentResource::createDocument(const KURL& url)
 {
     switch (type()) {
     case SVGDocument:
         return XMLDocument::createSVG(DocumentInit(url));
     default:
         // FIXME: We'll add more types to support HTMLImports.
         ASSERT_NOT_REACHED();
         return nullptr;
     }
 }
 
 }