chromeos: Remove old LockScreen signal.

chrome/browser/chromeos/login/screen_locker.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
@@ skipping 104 matching lines @@
   const UserList& users() const { return users_; }
 
   // Allow a LoginStatusConsumer to listen for
   // the same login events that ScreenLocker does.
   void SetLoginStatusConsumer(chromeos::LoginStatusConsumer* consumer);
 
   // Returns WebUI associated with screen locker implementation or NULL if
   // there isn't one.
   content::WebUI* GetAssociatedWebUI();
 
-  // Initialize ScreenLocker class. It will listen to
-  // LOGIN_USER_CHANGED notification so that the screen locker accepts
-  // lock event only after a user is logged in.
+  // Initialize or uninitialize the ScreenLocker class. It listens to
+  // NOTIFICATION_SESSION_STARTED so that the screen locker accepts lock
+  // requests only after a user has logged in.
   static void InitClass();
+  static void ShutDownClass();
 
   // Handles a request from the session manager to lock the screen.
   static void HandleLockScreenRequest();
 
   // Show the screen locker.
   static void Show();
 
   // Hide the screen locker.
   static void Hide();
 
@@ skipping 63 matching lines @@
   scoped_ptr<ScreenlockIconProvider> screenlock_icon_provider_;
 
   base::WeakPtrFactory<ScreenLocker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_H_