remove unused typedef in benzene.hh

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7677 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/material/components/benzene.hh

@@ -43,7 +43,6 @@ namespace Dumux
 template <class Scalar>
 class Benzene : public Component<Scalar, Benzene<Scalar> >
 {
-    typedef Component<Scalar, Benzene<Scalar> > ParentType;
 
 public:
     /*!