Implement SetWrapperReferenceTo idl attribute within traceWrappers for svg elements

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

Index: third_party/WebKit/Source/core/svg/SVGNumberListTearOff.h
diff --git a/third_party/WebKit/Source/core/svg/SVGNumberListTearOff.h b/third_party/WebKit/Source/core/svg/SVGNumberListTearOff.h
index 13e9514eb5fe0cd020dfd593b75e9010e7c90bce..b0691af14a47dfbf403a8e51704b24c44556312b 100644
--- a/third_party/WebKit/Source/core/svg/SVGNumberListTearOff.h
+++ b/third_party/WebKit/Source/core/svg/SVGNumberListTearOff.h
@@ -46,6 +46,11 @@ public:
         return new SVGNumberListTearOff(target, contextElement, propertyIsAnimVal, attributeName);
     }
 
+    DEFINE_INLINE_VIRTUAL_TRACE_WRAPPERS()
+    {
+        visitor->traceWrappers(contextElement());
+    }
+
 private:
     SVGNumberListTearOff(SVGNumberList* target, SVGElement* contextElement, PropertyIsAnimValType propertyIsAnimVal, const QualifiedName& attributeName = QualifiedName::null())
         : SVGListPropertyTearOffHelper<SVGNumberListTearOff, SVGNumberList>(target, contextElement, propertyIsAnimVal, attributeName) { }