Death to BlockSparseMatrixBase

Change-Id: I13b2b951297ae81bfab0a7b4991a791ed91d594c
diff --git a/internal/ceres/cgnr_solver.cc b/internal/ceres/cgnr_solver.cc
index e2e799f..9b8f980 100644
--- a/internal/ceres/cgnr_solver.cc
+++ b/internal/ceres/cgnr_solver.cc
@@ -46,7 +46,7 @@
 }
 
 LinearSolver::Summary CgnrSolver::SolveImpl(
-    BlockSparseMatrixBase* A,
+    BlockSparseMatrix* A,
     const double* b,
     const LinearSolver::PerSolveOptions& per_solve_options,
     double* x) {