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 d2726479fb5560e5e4a5f334b05d9f37f64c70a0..a558d2a06620ec7521c8fdeeef1802f4c3e3e41e 100644
--- a/chrome/browser/upgrade_detector_impl.cc
+++ b/chrome/browser/upgrade_detector_impl.cc
@@ -417,8 +417,9 @@ 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) !=
+      network_time::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();