[oilpan] Handlify childrenChanged.

Source/core/html/HTMLOptionElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 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
@@ skipping 65 matching lines @@
     virtual bool isFocusable() const;
     virtual bool rendererIsNeeded(const NodeRenderingContext&) { return false; }
     virtual void attach();
     virtual void detach();
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     virtual InsertionNotificationRequest insertedInto(const Handle<ContainerNode>&) OVERRIDE;
     virtual void accessKeyAction(bool);
 
-    virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
+    virtual void childrenChanged(bool changedByParser = false, const Handle<Node>& beforeChange = nullptr, const Handle<Node>& afterChange = nullptr, int childCountDelta = 0);
 
     // <option> never has a renderer so we manually manage a cached style.
     void updateNonRenderStyle();
     virtual RenderStyle* nonRendererStyle() const OVERRIDE;
     virtual PassRefPtr<RenderStyle> customStyleForRenderer() OVERRIDE;
 
     void didRecalcStyle(StyleChange) OVERRIDE;
 
     String collectOptionInnerText() const;
 
@@ skipping 23 matching lines @@
 inline Result<HTMLOptionElement> toHTMLOptionElement(const Handle<Node>& node)
 {
     return Handle<HTMLOptionElement>::cast(node);
 }
 
 #endif
 
 } // namespace
 
 #endif