[oilpan] Handlify childrenChanged.

Source/core/html/HTMLTextAreaElement.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, 2007, 2010 Apple 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 80 matching lines @@
     virtual bool isEnumeratable() const { return true; }
     virtual bool supportLabels() const OVERRIDE { return true; }
 
     virtual const AtomicString& formControlType() const;
 
     virtual FormControlState saveFormControlState() const OVERRIDE;
     virtual void restoreFormControlState(const FormControlState&) OVERRIDE;
 
     virtual bool isTextFormControl() const { return true; }
 
-    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);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, Handle<MutableStylePropertySet>) OVERRIDE;
     virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
     virtual bool appendFormData(FormDataList&, bool);
     virtual void reset();
     virtual bool hasCustomFocusLogic() const OVERRIDE;
     virtual bool isMouseFocusable() const;
     virtual bool isKeyboardFocusable(KeyboardEvent*) const;
     virtual void updateFocusAppearance(bool restorePreviousSelection);
@@ skipping 18 matching lines @@
 };
 
 inline bool isHTMLTextAreaElement(Node* node)
 {
     return node->hasTagName(HTMLNames::textareaTag);
 }
 
 } //namespace
 
 #endif