Always persist data to disk after 60s from the receiving update request.

net/http/http_server_properties_manager.cc

Index: net/http/http_server_properties_manager.cc
diff --git a/net/http/http_server_properties_manager.cc b/net/http/http_server_properties_manager.cc
index 9653e9269ba1d72827d8ecd4c1191ae66a1f7cfd..e8fac4a0438f38609738b2bfbff39aafa051e638 100644
--- a/net/http/http_server_properties_manager.cc
+++ b/net/http/http_server_properties_manager.cc
@@ -781,8 +781,10 @@ void HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread(
 void HttpServerPropertiesManager::ScheduleUpdatePrefsOnNetworkThread(
     Location location) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
-  // Cancel pending updates, if any.
-  network_prefs_update_timer_->Stop();
+  // Do not schedule a new update if there is already one scheduled.
+  if (network_prefs_update_timer_->IsRunning())
+    return;
+
   StartPrefsUpdateTimerOnNetworkThread(
       base::TimeDelta::FromMilliseconds(kUpdatePrefsDelayMs));
   // TODO(rtenneti): Delete the following histogram after collecting some data.