Correct variable name for last update check time

Align the name of the last update check time variable to the units
within it (seconds since epoch).

Bug: 70178109
Test: unit-tests
Change-Id: Ic06890f0e234528d80dc1bcd053e8b602c6f9309
(cherry picked from commit 4adf279cecb8b6c5f85d66e504b9c847b72e0e4c)
diff --git a/parcelable_update_engine_status_unittest.cc b/parcelable_update_engine_status_unittest.cc
index 3e6f7eb..f4bd518 100644
--- a/parcelable_update_engine_status_unittest.cc
+++ b/parcelable_update_engine_status_unittest.cc
@@ -40,8 +40,7 @@
                                   "2.3.4.5",
                                   "3.4.5.6"};
   ParcelableUpdateEngineStatus parcelable_status(ue_status);
-  EXPECT_EQ(ue_status.last_checked_time_ms,
-            parcelable_status.last_checked_time_);
+  EXPECT_EQ(ue_status.last_checked_time, parcelable_status.last_checked_time_);
   EXPECT_EQ(
       String16{chromeos_update_engine::UpdateStatusToString(ue_status.status)},
       parcelable_status.current_operation_);