[Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 226 matching lines @@
     RefPtr<SharedBuffer> mhtmlData = SharedBuffer::create();
     MHTMLArchive::generateMHTMLHeader(boundary, title, mimeType, *mhtmlData);
     for (const auto& resource : resources) {
         MHTMLArchive::generateMHTMLPart(
             boundary, encodingPolicy, resource, *mhtmlData);
     }
     MHTMLArchive::generateMHTMLFooter(boundary, *mhtmlData);
     return mhtmlData.release();
 }
 
+ArchiveResource* MHTMLArchive::mainResource() const
+{
+    return m_mainResource.get();
+}
+
 #if !ENABLE(OILPAN)
 void MHTMLArchive::clearAllSubframeArchives()
 {
     SubFrameArchives clearedArchives;
     clearAllSubframeArchivesImpl(&clearedArchives);
 }
 
 void MHTMLArchive::clearAllSubframeArchivesImpl(SubFrameArchives* clearedArchives)
 {
     for (SubFrameArchives::iterator it = m_subframeArchives.begin(); it != m_subframeArchives.end(); ++it) {
@@ skipping 22 matching lines @@
 }
 
 DEFINE_TRACE(MHTMLArchive)
 {
     visitor->trace(m_mainResource);
     visitor->trace(m_subresources);
     visitor->trace(m_subframeArchives);
 }
 
 }