Revert of Oilpan: move ScriptLoader to the heap.

Source/core/svg/SVGScriptElement.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 28 matching lines @@
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<SVGScriptElement> create(Document&, bool wasInsertedByParser);
 
     ScriptLoader* loader() const { return m_loader.get(); }
 
 #if ENABLE(ASSERT)
     virtual bool isAnimatableAttribute(const QualifiedName&) const override;
 #endif
 
-    virtual void trace(Visitor*) override;
-
 private:
     SVGScriptElement(Document&, bool wasInsertedByParser, bool alreadyStarted);
     virtual ~SVGScriptElement();
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) override;
     virtual void didNotifySubtreeInsertionsToDocument() override;
     virtual void childrenChanged(const ChildrenChange&) override;
     virtual void didMoveToNewDocument(Document& oldDocument) override;
 
@@ skipping 14 matching lines @@
     virtual bool deferAttributeValue() const override;
     virtual bool hasSourceAttribute() const override;
 
     virtual void dispatchLoadEvent() override;
 
     virtual PassRefPtrWillBeRawPtr<Element> cloneElementWithoutAttributesAndChildren() override;
     virtual bool rendererIsNeeded(const RenderStyle&) override { return false; }
 
     virtual Timer<SVGElement>* svgLoadEventTimer() override { return &m_svgLoadEventTimer; }
 
+
     Timer<SVGElement> m_svgLoadEventTimer;
-    OwnPtrWillBeMember<ScriptLoader> m_loader;
+    OwnPtr<ScriptLoader> m_loader;
 };
 
 } // namespace blink
 
 #endif // SVGScriptElement_h