Do not allow creating dummy notifier id from production, for safety.

ash/shell/window_type_launcher.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/shell/window_type_launcher.h"
 
 #include "ash/root_window_controller.h"
 #include "ash/screensaver/screensaver_view.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shelf/shelf_widget.h"
@@ skipping 326 matching lines @@
 
   } else if (sender == show_web_notification_) {
     scoped_ptr<message_center::Notification> notification;
     notification.reset(new message_center::Notification(
         message_center::NOTIFICATION_TYPE_SIMPLE,
         "id0",
         ASCIIToUTF16("Test Shell Web Notification"),
         ASCIIToUTF16("Notification message body."),
         gfx::Image(),
         ASCIIToUTF16("www.testshell.org"),
-        message_center::NotifierId(),
+        message_center::NotifierId(
+            message_center::NotifierId::APPLICATION, "test-id"),
         message_center::RichNotificationData(),
         NULL /* delegate */));
 
     ash::Shell::GetPrimaryRootWindowController()->shelf()->status_area_widget()
         ->web_notification_tray()->message_center()
         ->AddNotification(notification.Pass());
   } else if (sender == examples_button_) {
     views::examples::ShowExamplesWindowWithContent(
         views::examples::DO_NOTHING_ON_CLOSE,
         Shell::GetInstance()->delegate()->GetCurrentBrowserContext(),
@@ skipping 31 matching lines @@
         gfx::Rect(point, gfx::Size()),
         MenuItemView::TOPLEFT,
         source_type,
         MenuRunner::HAS_MNEMONICS | views::MenuRunner::CONTEXT_MENU) ==
         MenuRunner::MENU_DELETED)
     return;
 }
 
 }  // namespace shell
 }  // namespace ash