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

Source/core/rendering/RenderWidget.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * 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 92 matching lines @@
 
     Widget* widget = this->widget();
     ASSERT(widget);
 
     IntRect newFrame = roundedIntRect(frame);
 
     if (widget->frameRect() == newFrame)
         return false;
 
     RefPtr<RenderWidget> protector(this);
-    RefPtr<Node> protectedNode(node());
+    RefPtrWillBeRawPtr<Node> protectedNode(node());
     widget->setFrameRect(newFrame);
     return widget->frameRect().size() != newFrame.size();
 }
 
 bool RenderWidget::updateWidgetGeometry()
 {
     Widget* widget = this->widget();
     ASSERT(widget);
 
     LayoutRect contentBox = contentBoxRect();
@@ skipping 191 matching lines @@
 CursorDirective RenderWidget::getCursor(const LayoutPoint& point, Cursor& cursor) const
 {
     if (widget() && widget()->isPluginView()) {
         // A plug-in is responsible for setting the cursor when the pointer is over it.
         return DoNotSetCursor;
     }
     return RenderReplaced::getCursor(point, cursor);
 }
 
 } // namespace WebCore