Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/common/session/session_controller.h

 // Copyright 2016 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_SESSION_CONTROLLER_H_
-#define ASH_SESSION_SESSION_CONTROLLER_H_
+#ifndef ASH_COMMON_SESSION_SESSION_CONTROLLER_H_
+#define ASH_COMMON_SESSION_SESSION_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/public/cpp/session_types.h"
 #include "ash/public/interfaces/session_controller.mojom.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
@@ skipping 101 matching lines @@
   // to detect first active user session.
   uint32_t active_session_id_ = 0u;
 
   base::ObserverList<ash::SessionStateObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionController);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SESSION_SESSION_CONTROLLER_H_
+#endif  // ASH_COMMON_SESSION_SESSION_CONTROLLER_H_