Update from https://crrev.com/315085

net/android/network_change_notifier_android.cc

 // Copyright (c) 2012 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.
 
 ////////////////////////////////////////////////////////////////////////////////
 // Threading considerations:
 //
 // This class is designed to meet various threading guarantees starting from the
 // ones imposed by NetworkChangeNotifier:
 // - The notifier can be constructed on any thread.
@@ skipping 59 matching lines @@
 class NetworkChangeNotifierAndroid::DnsConfigServiceThread
     : public base::Thread {
  public:
   DnsConfigServiceThread()
       : base::Thread("DnsConfigService"),
         address_tracker_(base::Bind(base::DoNothing),
                          base::Bind(base::DoNothing),
                          // We're only interested in tunnel interface changes.
                          base::Bind(NotifyNetworkChangeNotifierObservers)) {}
 
-  virtual ~DnsConfigServiceThread() {
-    Stop();
-  }
+  ~DnsConfigServiceThread() override { Stop(); }
 
-  virtual void Init() override {
+  void Init() override {
     address_tracker_.Init();
     dns_config_service_ = DnsConfigService::CreateSystemService();
     dns_config_service_->WatchConfig(
         base::Bind(&NetworkChangeNotifier::SetDnsConfig));
   }
 
-  virtual void CleanUp() override {
-    dns_config_service_.reset();
-  }
+  void CleanUp() override { dns_config_service_.reset(); }
 
   static void NotifyNetworkChangeNotifierObservers() {
     NetworkChangeNotifier::NotifyObserversOfIPAddressChange();
     NetworkChangeNotifier::NotifyObserversOfConnectionTypeChange();
   }
 
  private:
   scoped_ptr<DnsConfigService> dns_config_service_;
   // Used to detect tunnel state changes.
   internal::AddressTrackerLinux address_tracker_;
@@ skipping 47 matching lines @@
   // so delay IPAddressChanged so they get merged with the following
   // ConnectionTypeChanged signal.
   params.ip_address_offline_delay_ = base::TimeDelta::FromSeconds(1);
   params.ip_address_online_delay_ = base::TimeDelta::FromSeconds(1);
   params.connection_type_offline_delay_ = base::TimeDelta::FromSeconds(0);
   params.connection_type_online_delay_ = base::TimeDelta::FromSeconds(0);
   return params;
 }
 
 }  // namespace net