Rename SessionStateController -> LockStateController

ash/wm/session_lock_state_observer.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 ASH_WM_SESSION_STATE_OBSERVER_H_
 #define ASH_WM_SESSION_STATE_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
 namespace ash {
 
 // Interface for classes that want to be notified by SessionStateController when
 // session-related events occur.
-class ASH_EXPORT SessionStateObserver {
+class ASH_EXPORT SessionLockStateObserver {
  public:
   enum EventType {
     EVENT_PRELOCK_ANIMATION_STARTED,
     EVENT_LOCK_ANIMATION_STARTED,
     EVENT_LOCK_ANIMATION_FINISHED,
   };
 
-  virtual void OnSessionStateEvent(EventType event) = 0;
-  virtual ~SessionStateObserver() {};
+  virtual void OnSessionLockStateEvent(EventType event) = 0;
+  virtual ~SessionLockStateObserver() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_SESSION_STATE_CONTROLLER_H_