Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGTextPositioningElement.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGTextPositioningElement_h
 #define SVGTextPositioningElement_h
 
 #include "core/SVGNames.h"
 #include "core/svg/SVGAnimatedLengthList.h"
 #include "core/svg/SVGAnimatedNumberList.h"
 #include "core/svg/SVGTextContentElement.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SVGTextPositioningElement : public SVGTextContentElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static SVGTextPositioningElement* elementFromRenderer(RenderObject&);
 
     SVGAnimatedLengthList* x() { return m_x.get(); }
     SVGAnimatedLengthList* y() { return m_y.get(); }
     SVGAnimatedLengthList* dx() { return m_dx.get(); }
     SVGAnimatedLengthList* dy() { return m_dy.get(); }
     SVGAnimatedNumberList* rotate() { return m_rotate.get(); }
 
+    virtual void trace(Visitor*) override;
+
 protected:
     SVGTextPositioningElement(const QualifiedName&, Document&);
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override final;
     virtual void svgAttributeChanged(const QualifiedName&) override final;
     virtual bool isTextPositioning() const override final { return true; }
 
-    RefPtr<SVGAnimatedLengthList> m_x;
-    RefPtr<SVGAnimatedLengthList> m_y;
-    RefPtr<SVGAnimatedLengthList> m_dx;
-    RefPtr<SVGAnimatedLengthList> m_dy;
-    RefPtr<SVGAnimatedNumberList> m_rotate;
+    RefPtrWillBeMember<SVGAnimatedLengthList> m_x;
+    RefPtrWillBeMember<SVGAnimatedLengthList> m_y;
+    RefPtrWillBeMember<SVGAnimatedLengthList> m_dx;
+    RefPtrWillBeMember<SVGAnimatedLengthList> m_dy;
+    RefPtrWillBeMember<SVGAnimatedNumberList> m_rotate;
 };
 
 inline bool isSVGTextPositioningElement(const SVGElement& element)
 {
     return element.isTextPositioning();
 }
 
 DEFINE_SVGELEMENT_TYPE_CASTS_WITH_FUNCTION(SVGTextPositioningElement);
 
 } // namespace blink
 
 #endif // SVGTextPositioningElement_h