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

net/http/http_server_properties_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_server_properties_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 763 matching lines @@
   if (detected_corrupted_prefs)
     ScheduleUpdatePrefsOnNetworkThread(DETECTED_CORRUPTED_PREFS);
 }
 
 //
 // Update Preferences with data from the cached data.
 //
 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.
   UMA_HISTOGRAM_ENUMERATION("Net.HttpServerProperties.UpdatePrefs", location,
                             HttpServerPropertiesManager::NUM_LOCATIONS);
 }
 
 void HttpServerPropertiesManager::StartPrefsUpdateTimerOnNetworkThread(
     base::TimeDelta delay) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
@@ skipping 321 matching lines @@
                                                        quic_servers_dict);
 }
 
 void HttpServerPropertiesManager::OnHttpServerPropertiesChanged() {
   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
   if (!setting_prefs_)
     ScheduleUpdateCacheOnPrefThread();
 }
 
 }  // namespace net