Update {virtual,override,final} to follow C++11 style in net.

net/dns/dns_config_service_posix.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.
 
 #include "net/dns/dns_config_service_posix.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 46 matching lines @@
 };
 
 #elif defined(OS_ANDROID)
 // On Android, assume DNS config may have changed on every network change.
 class DnsConfigWatcher : public NetworkChangeNotifier::NetworkChangeObserver {
  public:
   DnsConfigWatcher() {
     NetworkChangeNotifier::AddNetworkChangeObserver(this);
   }
 
-  virtual ~DnsConfigWatcher() {
+  ~DnsConfigWatcher() override {
     NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
   }
 
   bool Watch(const base::Callback<void(bool succeeded)>& callback) {
     callback_ = callback;
     return true;
   }
 
-  virtual void OnNetworkChanged(NetworkChangeNotifier::ConnectionType type)
-      override {
+  void OnNetworkChanged(NetworkChangeNotifier::ConnectionType type) override {
     if (!callback_.is_null() && type != NetworkChangeNotifier::CONNECTION_NONE)
       callback_.Run(true);
   }
 
  private:
   base::Callback<void(bool succeeded)> callback_;
 };
 #elif !defined(OS_MACOSX)
 // DnsConfigWatcher for OS_MACOSX is in dns_config_watcher_mac.{hh,cc}.
 
@@ skipping 409 matching lines @@
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace internal
 
 // static
 scoped_ptr<DnsConfigService> DnsConfigService::CreateSystemService() {
   return scoped_ptr<DnsConfigService>(new internal::DnsConfigServicePosix());
 }
 
 }  // namespace net