Revert of [Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/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 39 matching lines @@
 DocumentResource::~DocumentResource()
 {
 }
 
 DEFINE_TRACE(DocumentResource)
 {
     visitor->trace(m_document);
     Resource::trace(visitor);
 }
 
-Document* DocumentResource::document() const
-{
-    return m_document.get();
-}
-
 void DocumentResource::setEncoding(const String& chs)
 {
     m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
 }
 
 String DocumentResource::encoding() const
 {
     return m_decoder->encoding().name();
 }
 
@@ skipping 16 matching lines @@
     case SVGDocument:
         return XMLDocument::createSVG(DocumentInit(url));
     default:
         // FIXME: We'll add more types to support HTMLImports.
         ASSERT_NOT_REACHED();
         return nullptr;
     }
 }
 
 }