Implement SetWrapperReferenceTo idl attribute within traceWrappers for svg elements

third_party/WebKit/Source/core/svg/SVGAnimatedString.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 31 matching lines @@
 public:
     static SVGAnimatedString* create(SVGElement* contextElement, const QualifiedName& attributeName, SVGString* initialValue)
     {
         return new SVGAnimatedString(contextElement, attributeName, initialValue);
     }
 
     virtual String baseVal();
     virtual void setBaseVal(const String&, ExceptionState&);
     virtual String animVal();
 
+    DECLARE_VIRTUAL_TRACE_WRAPPERS();
+
 protected:
     SVGAnimatedString(SVGElement* contextElement, const QualifiedName& attributeName, SVGString* initialValue)
         : SVGAnimatedProperty<SVGString>(contextElement, attributeName, initialValue)
     {
     }
 };
 
 } // namespace blink
 
 #endif // SVGAnimatedString_h