Fix potential threading issues in NetworkChangeNotifierAndroid.

net/android/network_change_notifier_factory_android.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/android/network_change_notifier_factory_android.h"
 
 #include "net/android/network_change_notifier_android.h"
 
 namespace net {
 
-NetworkChangeNotifierFactoryAndroid::NetworkChangeNotifierFactoryAndroid() {}
+NetworkChangeNotifierFactoryAndroid::NetworkChangeNotifierFactoryAndroid(
+    base::TaskRunner* ui_task_runner)
+    : ui_task_runner_(ui_task_runner) {
+}
 
 NetworkChangeNotifierFactoryAndroid::~NetworkChangeNotifierFactoryAndroid() {}
 
 NetworkChangeNotifier* NetworkChangeNotifierFactoryAndroid::CreateInstance() {
-  return new NetworkChangeNotifierAndroid();
+  return new NetworkChangeNotifierAndroid(ui_task_runner_);
 }
 
 }  // namespace net