LinearSolver::Options::num_eliminate_blocks is dead.

Replaced with LinearSolver::Options::elimination_groups.

Change-Id: I7c07542ec19279a35ddf6da498d417a79395c77f
diff --git a/internal/ceres/iterative_schur_complement_solver_test.cc b/internal/ceres/iterative_schur_complement_solver_test.cc
index d034747..86e7825 100644
--- a/internal/ceres/iterative_schur_complement_solver_test.cc
+++ b/internal/ceres/iterative_schur_complement_solver_test.cc
@@ -89,7 +89,7 @@
     Vector reference_solution(num_cols_);
     qr->Solve(&dense_A, b_.get(), per_solve_options, reference_solution.data());
 
-    options.num_eliminate_blocks = num_eliminate_blocks_;
+    options.elimination_groups.push_back(num_eliminate_blocks_);
     options.max_num_iterations = num_cols_;
     IterativeSchurComplementSolver isc(options);