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

Source/core/rendering/RenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 732 matching lines @@
             isFirstCounter = false;
             String str(toRenderText(child)->text());
             stream << str;
         }
     }
 }
 
 String counterValueForElement(Element* element)
 {
     // Make sure the element is not freed during the layout.
-    RefPtr<Element> elementRef(element);
+    RefPtrWillBeRawPtr<Element> protector(element);
     element->document().updateLayout();
     TextStream stream;
     bool isFirstCounter = true;
     // The counter renderers should be children of :before or :after pseudo-elements.
     if (RenderObject* before = element->pseudoElementRenderer(BEFORE))
         writeCounterValuesFromChildren(stream, before, isFirstCounter);
     if (RenderObject* after = element->pseudoElementRenderer(AFTER))
         writeCounterValuesFromChildren(stream, after, isFirstCounter);
     return stream.release();
 }
 
 String markerTextForListItem(Element* element)
 {
     // Make sure the element is not freed during the layout.
-    RefPtr<Element> elementRef(element);
+    RefPtrWillBeRawPtr<Element> protector(element);
     element->document().updateLayout();
 
     RenderObject* renderer = element->renderer();
     if (!renderer || !renderer->isListItem())
         return String();
 
     return toRenderListItem(renderer)->markerText();
 }
 
 } // namespace WebCore