Move from Ordering to ParameterBlockOrdering.

Change-Id: I9320afff13ee62be407c725f42f41a18f537bcc1
diff --git a/internal/ceres/system_test.cc b/internal/ceres/system_test.cc
index 4d78de7..8f1722a 100644
--- a/internal/ceres/system_test.cc
+++ b/internal/ceres/system_test.cc
@@ -44,7 +44,7 @@
 #include <string>
 
 #include "ceres/autodiff_cost_function.h"
-#include "ceres/ordering.h"
+#include "ceres/ordered_groups.h"
 #include "ceres/problem.h"
 #include "ceres/rotation.h"
 #include "ceres/solver.h"
@@ -387,15 +387,15 @@
       problem_.AddResidualBlock(cost_function, NULL, camera, point);
     }
 
-    options_.ordering = new Ordering;
+    options_.ordering = new ParameterBlockOrdering;
 
     // The points come before the cameras.
     for (int i = 0; i < num_points_; ++i) {
-      options_.ordering->AddParameterBlockToGroup(points + 3 * i, 0);
+      options_.ordering->AddElementToGroup(points + 3 * i, 0);
     }
 
     for (int i = 0; i < num_cameras_; ++i) {
-      options_.ordering->AddParameterBlockToGroup(cameras + 9 * i, 1);
+      options_.ordering->AddElementToGroup(cameras + 9 * i, 1);
     }
 
     options_.max_num_iterations = 25;