Oilpan: Replace RefPtrs to Node and its subclasses in core/loader with Oilpan transition types.

Source/core/loader/NavigationScheduler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Adam Barth. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
@@ skipping 100 matching lines @@
         request.setLockBackForwardList(lockBackForwardList());
         request.setClientRedirect(ClientRedirect);
         frame->loader().load(request);
     }
 
     Document* originDocument() const { return m_originDocument.get(); }
     String url() const { return m_url; }
     const Referrer& referrer() const { return m_referrer; }
 
 private:
-    RefPtr<Document> m_originDocument;
+    RefPtrWillBePersistent<Document> m_originDocument;
     String m_url;
     Referrer m_referrer;
 };
 
 class ScheduledRedirect FINAL : public ScheduledURLNavigation {
 public:
     ScheduledRedirect(double delay, Document* originDocument, const String& url, bool lockBackForwardList)
         : ScheduledURLNavigation(delay, originDocument, url, Referrer(), lockBackForwardList, false)
     {
         clearUserGesture();
@@ skipping 276 matching lines @@
 
 void NavigationScheduler::cancel()
 {
     if (m_timer.isActive())
         InspectorInstrumentation::frameClearedScheduledNavigation(m_frame);
     m_timer.stop();
     m_redirect.clear();
 }
 
 } // namespace WebCore