Revert "Partially Revert 2b9d241"

This reverts commit 71818c8409812c5a08124627c19aa8ea0625a72e.
This patch was created because the upstream update_engine was using
the new version of libchrome and the Chrome OS one was not. Now
that we are upreving libchrome on Chrome OS we can revert this.

BUG=b:37434548
TEST=Build
CQ-DEPEND=CL:1240033

Change-Id: I98b7d124212087292500701782de08b3d3ecc559
Reviewed-on: https://chromium-review.googlesource.com/1239818
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
diff --git a/update_manager/update_manager_unittest.cc b/update_manager/update_manager_unittest.cc
index 9625b53..125a60c 100644
--- a/update_manager/update_manager_unittest.cc
+++ b/update_manager/update_manager_unittest.cc
@@ -67,7 +67,9 @@
   now_exp.minute = 5;
   now_exp.second = 33;
   now_exp.millisecond = 675;
-  return Time::FromLocalExploded(now_exp);
+  Time time;
+  ignore_result(Time::FromLocalExploded(now_exp, &time));
+  return time;
 }
 
 }  // namespace