Unused typedefs

Author: andrjohns

stan/math/prim/prob/multi_student_t_cholesky_lpdf.hpp

@@ -58,8 +58,6 @@ return_type_t<T_y, T_dof, T_loc, T_covar> multi_student_t_cholesky_lpdf(
     const T_y& y, const T_dof& nu, const T_loc& mu, const T_covar& L) {
   static constexpr const char* function = "multi_student_t_cholesky";
   using T_covar_elem = typename scalar_type<T_covar>::type;
-  using lp_type = return_type_t<T_y, T_dof, T_loc, T_covar>;
-  using Eigen::Matrix;
   using T_return = return_type_t<T_y, T_dof, T_loc, T_covar>;
   using T_partials_return = partials_return_t<T_y, T_dof, T_loc, T_covar>;
   using matrix_partials_t