[oilpan] Implement accept methods to trace the class hierarchy of SVGElement and all sub-classes.

Source/core/svg/SVGFESpecularLightingElement.h

Index: Source/core/svg/SVGFESpecularLightingElement.h
diff --git a/Source/core/svg/SVGFESpecularLightingElement.h b/Source/core/svg/SVGFESpecularLightingElement.h
index 95706897b5e132df57164764020b0075753efd56..1ab5b3f402b81bfba4b3f04202cc47b79714bd33 100644
--- a/Source/core/svg/SVGFESpecularLightingElement.h
+++ b/Source/core/svg/SVGFESpecularLightingElement.h
@@ -35,6 +35,8 @@ public:
     static PassRefPtr<SVGFESpecularLightingElement> create(const QualifiedName&, const Handle<Document>&);
     void lightElementAttributeChanged(const SVGFELightElement*, const QualifiedName&);
 
+    virtual void accept(Visitor* visitor) const OVERRIDE { SVGFilterPrimitiveStandardAttributes::accept(visitor); }
+
 private:
     SVGFESpecularLightingElement(const QualifiedName&, const Handle<Document>&);