Fix iterative_refiner_test.cc

Change-Id: I5f578ec1f7dc003c8da96ad410e95cacd2527076

internal/ceres/iterative_refiner_test.cc

diff --git a/internal/ceres/iterative_refiner_test.cc b/internal/ceres/iterative_refiner_test.cc
index 49887c6..244e7c1 100644
--- a/internal/ceres/iterative_refiner_test.cc
+++ b/internal/ceres/iterative_refiner_test.cc
@@ -109,12 +109,6 @@
                                         std::string* message) final
       DO_NOT_CALL_WITH_RETURN(LINEAR_SOLVER_FAILURE);
 
-  LinearSolverTerminationType FactorAndSolve(CompressedRowSparseMatrix* lhs,
-                                             const double* rhs,
-                                             double* solution,
-                                             std::string* message) final
-      DO_NOT_CALL_WITH_RETURN(LINEAR_SOLVER_FAILURE);
-
  private:
   Eigen::Matrix<Scalar, Eigen::Dynamic, Eigen::Dynamic> lhs_;
 };