When network time is unavailable, record the reason in UMA

chrome/browser/upgrade_detector_impl.cc

Index: chrome/browser/upgrade_detector_impl.cc
diff --git a/chrome/browser/upgrade_detector_impl.cc b/chrome/browser/upgrade_detector_impl.cc
index cd9668de8fa2ec3d5057eaaf8ea5c1045c8b5b22..c02279dc712c28572236876d4068940ff66f198f 100644
--- a/chrome/browser/upgrade_detector_impl.cc
+++ b/chrome/browser/upgrade_detector_impl.cc
@@ -410,8 +410,9 @@ bool UpgradeDetectorImpl::DetectOutdatedInstall() {
 
   base::Time network_time;
   base::TimeDelta uncertainty;
-  if (!g_browser_process->network_time_tracker()->GetNetworkTime(
-          &network_time, &uncertainty)) {
+  if (g_browser_process->network_time_tracker()->GetNetworkTime(&network_time,
+                                                                &uncertainty) !=
+      NetworkTimeTracker::NETWORK_TIME_AVAILABLE) {
     // When network time has not been initialized yet, simply rely on the
     // machine's current time.
     network_time = base::Time::Now();