Fix rotation_test.cc to work with older versions of Eigen

Change-Id: I699e4b45f9a1cc09e72f8140e67c800c3bcef8e0

internal/ceres/rotation_test.cc

diff --git a/internal/ceres/rotation_test.cc b/internal/ceres/rotation_test.cc
index 28a4271..3191ec5 100644
--- a/internal/ceres/rotation_test.cc
+++ b/internal/ceres/rotation_test.cc
@@ -1227,12 +1227,8 @@
   std::array<Jet, 4> quaternion = {
       Jet(1.0, 0), Jet(0.0, 1), Jet(0.0, 2), Jet(0.0, 3)};
   std::array<Jet, 3> point = {Jet(0.0), Jet(0.0), Jet(0.0)};
-  Eigen::Vector3<Jet> rotated_point;
+  std::array<Jet, 3> rotated_point;
   QuaternionRotatePoint(quaternion.data(), point.data(), rotated_point.data());
-  LOG(INFO) << rotated_point[0];
-  LOG(INFO) << rotated_point[1];
-  LOG(INFO) << rotated_point[2];
-
   for (int i = 0; i < 3; ++i) {
     EXPECT_EQ(rotated_point[i], point[i]);
     EXPECT_FALSE(rotated_point[i].v.array().isNaN().any());