Oilpan: Replace RefPtrs to Node and its subclasses in core/html with Oilpan transitin types.

Source/core/html/HTMLPlugInElement.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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 117 matching lines @@
         && !wouldLoadAsNetscapePlugin(m_url, m_serviceType)
         && !m_isDelayingLoadEvent) {
         m_isDelayingLoadEvent = true;
         document().incrementLoadEventDelayCount();
         document().loadPluginsSoon();
     }
 }
 
 void HTMLPlugInElement::updateWidget()
 {
-    RefPtr<HTMLPlugInElement> protector(this);
+    RefPtrWillBeRawPtr<HTMLPlugInElement> protector(this);
     updateWidgetInternal();
     if (m_isDelayingLoadEvent) {
         m_isDelayingLoadEvent = false;
         document().decrementLoadEventDelayCount();
     }
 }
 
 void HTMLPlugInElement::requestPluginCreationWithoutRendererIfPossible()
 {
     if (m_serviceType.isEmpty())
@@ skipping 410 matching lines @@
 {
     return false;
 }
 
 bool HTMLPlugInElement::useFallbackContent() const
 {
     return hasAuthorShadowRoot();
 }
 
 }