[oilpan] Handlify childrenChanged.

Source/core/html/HTMLStyleElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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 52 matching lines @@
 
     virtual void accept(Visitor*) const OVERRIDE;
 
 private:
     HTMLStyleElement(const QualifiedName&, Handle<Document>, bool createdByParser);
 
     // overload from HTMLElement
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(const Handle<ContainerNode>&) OVERRIDE;
     virtual void removedFrom(const Handle<ContainerNode>&) OVERRIDE;
-    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 finishParsingChildren();
 
     virtual bool isLoading() const { return StyleElement::isLoading(); }
     virtual bool sheetLoaded() { return StyleElement::sheetLoaded(document()); }
     virtual void notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred);
     virtual void startLoadingDynamicSheet() { StyleElement::startLoadingDynamicSheet(document()); }
 
     virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const;
 
@@ skipping 11 matching lines @@
         NotRegistered,
         RegisteredAsScoped,
         RegisteredInShadowRoot
     };
     ScopedStyleRegistrationState m_scopedStyleRegistrationState;
 };
 
 } //namespace
 
 #endif