Add DeviceDisablingManager to manage device disabling

chrome/browser/chromeos/login/screens/base_screen_delegate.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_SCREENS_BASE_SCREEN_DELEGATE_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_DELEGATE_H_
 
 #include <string>
 
 namespace chromeos {
@@ skipping 31 matching lines @@
     ENTERPRISE_ENROLLMENT_BACK = 13,
     RESET_CANCELED = 14,
     KIOSK_AUTOLAUNCH_CANCELED = 15,
     KIOSK_AUTOLAUNCH_CONFIRMED = 16,
     KIOSK_ENABLE_COMPLETED = 17,
     TERMS_OF_SERVICE_DECLINED = 18,
     TERMS_OF_SERVICE_ACCEPTED = 19,
     WRONG_HWID_WARNING_SKIPPED = 20,
     CONTROLLER_PAIRING_FINISHED = 21,
     HOST_PAIRING_FINISHED = 22,
-    DEVICE_NOT_DISABLED = 23,
     EXIT_CODES_COUNT  // not a real code, must be the last
   };
 
   // Method called by a screen when user's done with it.
   virtual void OnExit(ExitCodes exit_code) = 0;
 
   // Forces current screen showing.
   virtual void ShowCurrentScreen() = 0;
 
   virtual ErrorScreen* GetErrorScreen() = 0;
   virtual void ShowErrorScreen() = 0;
   virtual void HideErrorScreen(BaseScreen* parent_screen) = 0;
 
  protected:
   virtual ~BaseScreenDelegate() {}
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_DELEGATE_H_