[cros/net] Add DnsConfigService to NetworkChangeNotifierChromeos.

net/dns/dns_config_service_win.cc

Index: net/dns/dns_config_service_win.cc
diff --git a/net/dns/dns_config_service_win.cc b/net/dns/dns_config_service_win.cc
index 8fa72090d2d91671d55616a775c9d15a394cc880..1e4f1534fbb1c18b09eb8381186ffab5f1ea30d9 100644
--- a/net/dns/dns_config_service_win.cc
+++ b/net/dns/dns_config_service_win.cc
@@ -656,8 +656,7 @@ class DnsConfigServiceWin::HostsReader : public SerialWorker {
 };
 
 DnsConfigServiceWin::DnsConfigServiceWin()
-    : watcher_(new Watcher(this)),
-      config_reader_(new ConfigReader(this)),
+    : config_reader_(new ConfigReader(this)),
       hosts_reader_(new HostsReader(this)) {}
 
 DnsConfigServiceWin::~DnsConfigServiceWin() {
@@ -672,6 +671,7 @@ void DnsConfigServiceWin::ReadNow() {
 
 bool DnsConfigServiceWin::StartWatching() {
   // TODO(szym): re-start watcher if that makes sense. http://crbug.com/116139
+  watcher_.reset(new Watcher(this));
   return watcher_->Watch();
 }