DENSE_QR solver now uses non pivoting QR decomposition.

Change-Id: I9099221448ccf71d0de20b9f652405009a6c24c5

internal/ceres/dense_qr_solver.cc

diff --git a/internal/ceres/dense_qr_solver.cc b/internal/ceres/dense_qr_solver.cc
index 1fb9709..4ab75ab 100644
--- a/internal/ceres/dense_qr_solver.cc
+++ b/internal/ceres/dense_qr_solver.cc
@@ -73,7 +73,7 @@
   event_logger.AddEvent("Setup");
 
   // Solve the system.
-  VectorRef(x, num_cols) = A->matrix().colPivHouseholderQr().solve(rhs_);
+  VectorRef(x, num_cols) = A->matrix().householderQr().solve(rhs_);
   event_logger.AddEvent("Solve");
 
   if (per_solve_options.D != NULL) {