Avoid initial NetworkChangeNotifier OnDNSChanged() signal on Android

chrome/browser/net/dns_probe_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
 #define CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 21 matching lines @@
   typedef base::Callback<void(chrome_common_net::DnsProbeStatus result)>
       ProbeCallback;
 
   DnsProbeService();
   ~DnsProbeService() override;
 
   virtual void ProbeDns(const ProbeCallback& callback);
 
   // NetworkChangeNotifier::DNSObserver implementation:
   void OnDNSChanged() override;
+  void OnInitialDNSConfigRead() override;
 
   void SetSystemClientForTesting(scoped_ptr<net::DnsClient> system_client);
   void SetPublicClientForTesting(scoped_ptr<net::DnsClient> public_client);
   void ClearCachedResultForTesting();
 
  private:
   enum State {
     STATE_NO_RESULT,
     STATE_PROBE_RUNNING,
     STATE_RESULT_CACHED,
@@ skipping 20 matching lines @@
   // DnsProbeRunners for the system DNS configuration and a public DNS server.
   DnsProbeRunner system_runner_;
   DnsProbeRunner public_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsProbeService);
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_DNS_PROBE_SERVICE_H_