Revert 194578 "Add ash SessionStateDelegate"

trunk/src/ash/session_state_delegate.h

-// Copyright (c) 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.
-
-#ifndef ASH_SESSION_STATE_DELEGATE_H_
-#define ASH_SESSION_STATE_DELEGATE_H_
-
-#include "ash/ash_export.h"
-
-namespace ash {
-
-// Delegate for checking and modifying the session state.
-class ASH_EXPORT SessionStateDelegate {
- public:
-  virtual ~SessionStateDelegate() {};
-
-  // Returns |true| if a session is in progress and there is an active user.
-  virtual bool HasActiveUser() const = 0;
-
-  // Returns |true| if the session has been fully started for the active user.
-  // When a user becomes active, the profile and browser UI are not immediately
-  // available. Only once this method starts returning |true| is the browser
-  // startup complete and both profile and UI are fully available.
-  virtual bool IsActiveUserSessionStarted() const = 0;
-
-  // Returns true if the screen can be locked.
-  virtual bool CanLockScreen() const = 0;
-
-  // Returns true if the screen is currently locked.
-  virtual bool IsScreenLocked() const = 0;
-
-  // Locks the screen. The locking happens asynchronously.
-  virtual void LockScreen() = 0;
-
-  // Unlocks the screen.
-  virtual void UnlockScreen() = 0;
-};
-
-}  // namespace ash
-
-#endif  // ASH_SESSION_STATE_DELEGATE_H_