chromeos: Remove references to UnlockScreenFailed 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_
 #pragma once
 
 #include <string>
 
@@ skipping 75 matching lines @@
   // LOGIN_USER_CHANGED notification so that the screen locker accepts
   // lock event only after a user is logged in.
   static void InitClass();
 
   // Show the screen locker.
   static void Show();
 
   // Hide the screen locker.
   static void Hide();
 
-  // Notifies that PowerManager rejected UnlockScreen request.
-  static void UnlockScreenFailed();
-
   // Returns the tester
   static test::ScreenLockerTester* GetTester();
 
  private:
   friend class base::DeleteHelper<ScreenLocker>;
   friend class test::ScreenLockerTester;
   friend class test::ScreenLockerViewsTester;
   friend class test::WebUIScreenLockerTester;
   friend class ScreenLockerDelegate;
 
@@ skipping 38 matching lines @@
 
   // Number of bad login attempts in a row.
   int incorrect_passwords_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_H_