Oilpan: move SVG property hierarchy to the heap.

Source/core/svg/SVGZoomEvent.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * 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 SVGZoomEvent_h
 #define SVGZoomEvent_h
 
 #include "core/events/UIEvent.h"
 #include "core/svg/SVGPoint.h"
 #include "core/svg/SVGRect.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SVGZoomEvent final : public UIEvent {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<SVGZoomEvent> create()
     {
         return adoptRefWillBeNoop(new SVGZoomEvent);
     }
 
     // 'SVGZoomEvent' functions
-    PassRefPtr<SVGRectTearOff> zoomRectScreen() const;
+    PassRefPtrWillBeRawPtr<SVGRectTearOff> zoomRectScreen() const;
 
     float previousScale() const;
 
-    PassRefPtr<SVGPointTearOff> previousTranslate() const;
+    PassRefPtrWillBeRawPtr<SVGPointTearOff> previousTranslate() const;
 
     float newScale() const;
 
-    PassRefPtr<SVGPointTearOff> newTranslate() const;
+    PassRefPtrWillBeRawPtr<SVGPointTearOff> newTranslate() const;
 
     virtual const AtomicString& interfaceName() const override;
 
     virtual void trace(Visitor*) override;
 
 private:
     SVGZoomEvent();
 
     float m_newScale;
     float m_previousScale;
 
     FloatPoint m_newTranslate;
     FloatPoint m_previousTranslate;
 };
 
 } // namespace blink
 
 #endif // SVGZoomEvent_h