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

chrome/browser/notifications/login_state_notification_blocker_chromeos_browsertest.cc

 // Copyright 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 "ash/shell.h"
 #include "ash/system/system_notifier.h"
 #include "base/command_line.h"
 #include "chrome/browser/chromeos/login/login_manager_test.h"
 #include "chrome/browser/chromeos/login/startup_utils.h"
 #include "chrome/browser/chromeos/login/user_adding_screen.h"
@@ skipping 71 matching lines @@
 IN_PROC_BROWSER_TEST_F(LoginStateNotificationBlockerChromeOSBrowserTest,
                        PRE_BaseTest) {
   RegisterUser(kTestUsers[0]);
   RegisterUser(kTestUsers[1]);
   chromeos::StartupUtils::MarkOobeCompleted();
 }
 
 IN_PROC_BROWSER_TEST_F(LoginStateNotificationBlockerChromeOSBrowserTest,
                        BaseTest) {
   CreateBlocker();
-  message_center::NotifierId notifier_id;
+  message_center::NotifierId notifier_id(
+      message_center::NotifierId::APPLICATION, "test-notifier");
 
   // Logged in as a normal user.
   EXPECT_CALL(login_utils(), DoBrowserLaunch(_, _)).Times(1);
   LoginUser(kTestUsers[0]);
   EXPECT_EQ(1, GetStateChangedCountAndReset());
   EXPECT_TRUE(ShouldShowNotificationAsPopup(notifier_id));
 
   // Multi-login user switch.
   chromeos::UserAddingScreen::Get()->Start();
   content::RunAllPendingInMessageLoop();
@@ skipping 34 matching lines @@
   content::RunAllPendingInMessageLoop();
   EXPECT_EQ(1, GetStateChangedCountAndReset());
   EXPECT_TRUE(ShouldShowNotificationAsPopup(notifier_id));
 
   // Multi-login user switch off.
   chromeos::UserAddingScreen::Get()->Cancel();
   content::RunAllPendingInMessageLoop();
   EXPECT_EQ(1, GetStateChangedCountAndReset());
   EXPECT_TRUE(ShouldShowNotificationAsPopup(notifier_id));
 }