[net] HostResolverImpl + DnsTransaction + DnsConfigService = Asynchronous DNS ready for experiments.

net/dns/dns_config_service_win.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_win.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 436 matching lines @@
 
   TCHAR buffer[MAX_PATH];
   UINT rc = GetSystemDirectory(buffer, MAX_PATH);
   DCHECK(0 < rc && rc < MAX_PATH);
   FilePath hosts_path = FilePath(buffer).
       Append(FILE_PATH_LITERAL("drivers\\etc\\hosts"));
   hosts_watcher_->StartWatch(hosts_path, new DnsHostsReader(hosts_path, this));
 }
 
 // static
-DnsConfigService* DnsConfigService::CreateSystemService() {
-  return new DnsConfigServiceWin();
+scoped_ptr<DnsConfigService> DnsConfigService::CreateSystemService() {
+  return scoped_ptr<DnsConfigService>(new DnsConfigServiceWin());
 }
 
 }  // namespace net