[cros/net] Add DnsConfigService to NetworkChangeNotifierChromeos.

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 197 matching lines @@
   const FilePath path_;
   const CallbackType callback_;
   // Written in DoWork, read in OnWorkFinished, no locking necessary.
   DnsHosts hosts_;
   bool success_;
 
   DISALLOW_COPY_AND_ASSIGN(HostsReader);
 };
 
 DnsConfigServicePosix::DnsConfigServicePosix()
-    : watcher_(new Watcher(this)),
-      config_reader_(new ConfigReader(this)),
+    : config_reader_(new ConfigReader(this)),
       hosts_reader_(new HostsReader(this)) {}
 
 DnsConfigServicePosix::~DnsConfigServicePosix() {
   config_reader_->Cancel();
   hosts_reader_->Cancel();
 }
 
 void DnsConfigServicePosix::ReadNow() {
   config_reader_->WorkNow();
   hosts_reader_->WorkNow();
 }
 
 bool DnsConfigServicePosix::StartWatching() {
   // TODO(szym): re-start watcher if that makes sense. http://crbug.com/116139
+  watcher_.reset(new Watcher(this));
   return watcher_->Watch();
 }
 
 void DnsConfigServicePosix::OnConfigChanged(bool succeeded) {
   InvalidateConfig();
   if (succeeded) {
     config_reader_->WorkNow();
   } else {
     LOG(ERROR) << "DNS config watch failed.";
     set_watch_failed(true);
@@ skipping 123 matching lines @@
   virtual void ReadNow() OVERRIDE {}
   virtual bool StartWatching() OVERRIDE { return false; }
 };
 // static
 scoped_ptr<DnsConfigService> DnsConfigService::CreateSystemService() {
   return scoped_ptr<DnsConfigService>(new StubDnsConfigService());
 }
 #endif
 
 }  // namespace net