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/update_manager/real_updater_provider.cc b/update_manager/real_updater_provider.cc
index efa3609..050bd42 100644
--- a/update_manager/real_updater_provider.cc
+++ b/update_manager/real_updater_provider.cc
@@ -73,7 +73,7 @@
 
   inline bool is_success() { return is_success_; }
   inline int64_t last_checked_time() {
-    return update_engine_status_.last_checked_time_ms;
+    return update_engine_status_.last_checked_time;
   }
   inline double progress() { return update_engine_status_.progress; }
   inline const string update_status() {
diff --git a/update_manager/real_updater_provider_unittest.cc b/update_manager/real_updater_provider_unittest.cc
index 72e664b..efe042c 100644
--- a/update_manager/real_updater_provider_unittest.cc
+++ b/update_manager/real_updater_provider_unittest.cc
@@ -69,8 +69,8 @@
   return Time::FromLocalExploded(exp);
 }
 
-ACTION_P(ActionSetUpdateEngineStatusLastCheckedTime, time_ms) {
-  arg0->last_checked_time_ms = time_ms;
+ACTION_P(ActionSetUpdateEngineStatusLastCheckedTime, time) {
+  arg0->last_checked_time = time;
 };
 
 ACTION_P(ActionSetUpdateEngineStatusProgress, progress) {