Avoid initial NetworkChangeNotifier OnDNSChanged() signal on Android

net/android/network_change_notifier_android.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 NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_
 #define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_
 
 #include "base/android/jni_android.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "net/android/network_change_notifier_delegate_android.h"
 #include "net/base/network_change_notifier.h"
 
 namespace net {
 
+struct DnsConfig;
 class NetworkChangeNotifierAndroidTest;
 class NetworkChangeNotifierFactoryAndroid;
 
 // NetworkChangeNotifierAndroid observes network events from the Android
 // notification system and forwards them to observers.
 //
 // The implementation is complicated by the differing lifetime and thread
 // affinity requirements of Android notifications and of NetworkChangeNotifier.
 //
 // High-level overview:
@@ skipping 33 matching lines @@
   // Promote GetMaxBandwidthForConnectionSubtype to public for the Android
   // delegate class.
   using NetworkChangeNotifier::GetMaxBandwidthForConnectionSubtype;
 
  private:
   friend class NetworkChangeNotifierAndroidTest;
   friend class NetworkChangeNotifierFactoryAndroid;
 
   class DnsConfigServiceThread;
 
-  explicit NetworkChangeNotifierAndroid(
-      NetworkChangeNotifierDelegateAndroid* delegate);
+  NetworkChangeNotifierAndroid(NetworkChangeNotifierDelegateAndroid* delegate,
+                               const DnsConfig* dns_config_for_testing);
 
   static NetworkChangeCalculatorParams NetworkChangeCalculatorParamsAndroid();
 
   NetworkChangeNotifierDelegateAndroid* const delegate_;
   scoped_ptr<DnsConfigServiceThread> dns_config_service_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierAndroid);
 };
 
 }  // namespace net
 
 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_ANDROID_H_