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

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/compiler_specific.h"
 #include "base/file_path.h"
@@ skipping 66 matching lines @@
 
 void DnsConfigServicePosix::Watch() {
   DCHECK(CalledOnValidThread());
   config_watcher_->StartWatch(FilePath(FILE_PATH_LITERAL(_PATH_RESCONF)),
                               new ConfigReader(this));
   FilePath hosts_path(FILE_PATH_LITERAL("/etc/hosts"));
   hosts_watcher_->StartWatch(hosts_path, new DnsHostsReader(hosts_path, this));
 }
 
 // static
-DnsConfigService* DnsConfigService::CreateSystemService() {
-  return new DnsConfigServicePosix();
+scoped_ptr<DnsConfigService> DnsConfigService::CreateSystemService() {
+  return scoped_ptr<DnsConfigService>(new DnsConfigServicePosix());
 }
 
 #if !defined(OS_ANDROID)
 bool ConvertResStateToDnsConfig(const struct __res_state& res,
                                 DnsConfig* dns_config) {
   CHECK(dns_config != NULL);
   DCHECK(res.options & RES_INIT);
 
   dns_config->nameservers.clear();
 
@@ skipping 39 matching lines @@
 #if defined(RES_ROTATE)
   dns_config->rotate = res.options & RES_ROTATE;
 #endif
   dns_config->edns0 = res.options & RES_USE_EDNS0;
 
   return true;
 }
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace net