cros: Use SessionController for lock starting code

ash/wm/lock_state_controller.h

 // 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.
 
 #ifndef ASH_WM_LOCK_STATE_CONTROLLER_H_
 #define ASH_WM_LOCK_STATE_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 98 matching lines @@
   // restart depending on the the state of the |RebootOnShutdown| device policy.
   void RequestShutdown();
 
   // Called when ScreenLocker is ready to close, but not yet destroyed.
   // Can be used to display "hiding" animations on unlock.
   // |callback| will be called when all animations are done.
   void OnLockScreenHide(base::Closure callback);
 
   // Sets up the callback that should be called once lock animation is finished.
   // Callback is guaranteed to be called once and then discarded.
-  void SetLockScreenDisplayedCallback(const base::Closure& callback);
+  void SetLockScreenDisplayedCallback(base::OnceClosure callback);
 
   // aura::WindowTreeHostObserver override:
   void OnHostCloseRequested(const aura::WindowTreeHost* host) override;
 
   // SessionObserver overrides:
   void OnChromeTerminating() override;
   void OnLockStateChanged(bool locked) override;
 
   void set_animator_for_test(SessionStateAnimator* animator) {
     animator_.reset(animator);
@@ skipping 103 matching lines @@
 
   // Started when we begin displaying the pre-shutdown animation.  When it
   // fires, we start the shutdown animation and get ready to request shutdown.
   base::OneShotTimer pre_shutdown_timer_;
 
   // Started when we display the shutdown animation.  When it fires, we actually
   // request shutdown.  Gives the animation time to complete before Chrome, X,
   // etc. are shut down.
   base::OneShotTimer real_shutdown_timer_;
 
-  base::Closure lock_screen_displayed_callback_;
+  base::OnceClosure lock_screen_displayed_callback_;
 
   ScopedSessionObserver scoped_session_observer_;
 
   base::WeakPtrFactory<LockStateController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LockStateController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_LOCK_STATE_CONTROLLER_H_