HttpServerProperties - Don't persist if SetSupportsQuic is called with

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 "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 319 matching lines @@
 bool HttpServerPropertiesManager::GetSupportsQuic(
     IPAddressNumber* last_address) const {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   return http_server_properties_impl_->GetSupportsQuic(last_address);
 }
 
 void HttpServerPropertiesManager::SetSupportsQuic(
     bool used_quic,
     const IPAddressNumber& address) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
+  IPAddressNumber old_last_quic_addr;
+  http_server_properties_impl_->GetSupportsQuic(&old_last_quic_addr);
   http_server_properties_impl_->SetSupportsQuic(used_quic, address);
-  ScheduleUpdatePrefsOnNetworkThread(SET_SUPPORTS_QUIC);
+  IPAddressNumber new_last_quic_addr;
+  http_server_properties_impl_->GetSupportsQuic(&new_last_quic_addr);
+  if (old_last_quic_addr != new_last_quic_addr)
+    ScheduleUpdatePrefsOnNetworkThread(SET_SUPPORTS_QUIC);
 }
 
 void HttpServerPropertiesManager::SetServerNetworkStats(
     const HostPortPair& host_port_pair,
     ServerNetworkStats stats) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   ServerNetworkStats old_stats;
   const ServerNetworkStats* old_stats_ptr =
       http_server_properties_impl_->GetServerNetworkStats(host_port_pair);
   if (http_server_properties_impl_->GetServerNetworkStats(host_port_pair))
@@ skipping 634 matching lines @@
                                             server_network_stats_dict);
 }
 
 void HttpServerPropertiesManager::OnHttpServerPropertiesChanged() {
   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
   if (!setting_prefs_)
     ScheduleUpdateCacheOnPrefThread();
 }
 
 }  // namespace net