Pass implementation object to supplemental classes by reference

Source/core/svg/SVGZoomAndPan.h

 /*
  * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2014 Samsung Electronics. 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 61 matching lines @@
                     parseZoomAndPan(start, start + value.length());
                 }
             }
             return true;
         }
 
         return false;
     }
 
     // SVGZoomAndPan JS API.
-    static SVGZoomAndPanType zoomAndPan(SVGZoomAndPan* object) { return object->m_zoomAndPan; }
-    static void setZoomAndPan(SVGZoomAndPan* object, unsigned short value, ExceptionState&) { object->setZoomAndPan(value); }
-    static void setZoomAndPan(SVGViewSpec*, unsigned short, ExceptionState&);
+    static SVGZoomAndPanType zoomAndPan(SVGZoomAndPan& object) { return object.m_zoomAndPan; }
+    static void setZoomAndPan(SVGZoomAndPan& object, unsigned short value, ExceptionState&) { object.setZoomAndPan(value); }
+    static void setZoomAndPan(SVGViewSpec&, unsigned short, ExceptionState&);
 
     void setZoomAndPan(unsigned short value) { m_zoomAndPan = parseFromNumber(value); }
     SVGZoomAndPanType zoomAndPan() const { return m_zoomAndPan; }
 
 protected:
     SVGZoomAndPan();
     void resetZoomAndPan();
 
 private:
     SVGZoomAndPanType m_zoomAndPan;
 };
 
 } // namespace WebCore
 
 #endif // SVGZoomAndPan_h