Update NetworkStateNotifier to use message_center.

ash/system/chromeos/network/network_state_notifier_unittest.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 "ash/system/chromeos/network/network_state_notifier.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/system/chromeos/network/network_connect.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/test/ash_test_base.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/shill_device_client.h"
 #include "chromeos/dbus/shill_service_client.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
+#include "ui/message_center/message_center.h"
 
 namespace {
 
 ash::SystemTray* GetSystemTray() {
   return ash::Shell::GetPrimaryRootWindowController()->shelf()->
       status_area_widget()->system_tray();
 }
 
 }  // namespace
 
@@ skipping 55 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NetworkStateNotifierTest);
 };
 
 TEST_F(NetworkStateNotifierTest, ConnectionFailure) {
   EXPECT_FALSE(GetSystemTray()->HasNotificationBubble());
   ash::network_connect::ConnectToNetwork("wifi1", NULL /* owning_window */);
   RunAllPendingInMessageLoop();
   // Failure should spawn a notification.
-  EXPECT_TRUE(GetSystemTray()->CloseNotificationBubbleForTest());
+  message_center::MessageCenter* message_center =
+      message_center::MessageCenter::Get();
+  EXPECT_TRUE(message_center->HasNotification(
+      network_connect::kNetworkConnectNotificationId));
 }
 
 }  // namespace test
 }  // namespace ash