Partially Revert 2b9d241

2b9d2417722cd4052b0e22494886f93c5b4ef042 update_engine: Update libchrome APIS to r456626.

The above commit changes the libchrome API used in update_engine to r456626. But
the libchrome has not been upreved fully in the CrOS yet with the exception of
some changes represented in UE like CL:882543. So, now we need to revert the
changes partially untill the libchrome is updated.

BUG=chromium:815356
TEST=unittests, precq

Change-Id: If2207f0672c7b9f6dab84e676d9fb8423a047372
Reviewed-on: https://chromium-review.googlesource.com/965266
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>
diff --git a/update_manager/update_manager_unittest.cc b/update_manager/update_manager_unittest.cc
index c2766ea..03f1610 100644
--- a/update_manager/update_manager_unittest.cc
+++ b/update_manager/update_manager_unittest.cc
@@ -67,9 +67,7 @@
   now_exp.minute = 5;
   now_exp.second = 33;
   now_exp.millisecond = 675;
-  Time time;
-  ignore_result(Time::FromLocalExploded(now_exp, &time));
-  return time;
+  return Time::FromLocalExploded(now_exp);
 }
 
 }  // namespace