Update NetworkStateNotifier to use message_center.

ui/message_center/notification.cc

 // Copyright (c) 2013 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 "ui/message_center/notification.h"
 
 #include "base/logging.h"
+#include "ui/message_center/notification_delegate.h"
 #include "ui/message_center/notification_types.h"
 
 namespace {
 unsigned g_next_serial_number_ = 0;
 }
 
 namespace message_center {
 
 NotificationItem::NotificationItem(const string16& title,
                                    const string16& message)
@@ skipping 94 matching lines @@
   if (index >= optional_fields_.buttons.size())
     return;
   optional_fields_.buttons[index].icon = icon;
 }
 
 void Notification::SetSystemPriority() {
   optional_fields_.priority = SYSTEM_PRIORITY;
   optional_fields_.never_timeout = true;
 }
 
+// static
+scoped_ptr<Notification> Notification::CreateSystemNotification(
+    const std::string& notification_id,
+    const base::string16& title,
+    const base::string16& message,
+    const gfx::Image& icon,
+    const base::Closure& click_callback) {
+  scoped_ptr<Notification> notification(
+      new Notification(
+          NOTIFICATION_TYPE_SIMPLE,
+          notification_id,
+          title,
+          message,
+          icon,
+          base::string16()  /* display_source */,
+          std::string()  /* extension_id */,
+          RichNotificationData(),
+          new HandleNotificationClickedDelegate(click_callback)));
+  notification->SetSystemPriority();
+  return notification.Pass();
+}
+
 }  // namespace message_center