Implement SetWrapperReferenceTo idl attribute within traceWrappers for svg elements

third_party/WebKit/Source/core/svg/SVGPointTearOff.h

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
         return new SVGPointTearOff(target, contextElement, propertyIsAnimVal, attributeName);
     }
 
     void setX(float, ExceptionState&);
     void setY(float, ExceptionState&);
     float x() { return target()->x(); }
     float y() { return target()->y(); }
 
     SVGPointTearOff* matrixTransform(SVGMatrixTearOff*);
 
+    DECLARE_VIRTUAL_TRACE_WRAPPERS();
+
 protected:
     SVGPointTearOff(SVGPoint*, SVGElement* contextElement, PropertyIsAnimValType, const QualifiedName& attributeName = QualifiedName::null());
 };
 
 } // namespace blink
 
 #endif // SVGPointTearOff_h