Revert 267158 "CleanUp: Introduce UserInfo. Move session_state s..."

trunk/src/ash/session_state_observer.cc

 // 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.
 
 #include "ash/session_state_observer.h"
 
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 
 namespace ash {
 
 ScopedSessionStateObserver::ScopedSessionStateObserver(
     ash::SessionStateObserver* observer) : observer_(observer) {
   ash::Shell::GetInstance()->session_state_delegate()->
       AddSessionStateObserver(observer_);
 }
 
 ScopedSessionStateObserver::~ScopedSessionStateObserver() {
   ash::Shell::GetInstance()->session_state_delegate()->
       RemoveSessionStateObserver(observer_);
 }
 
 }  // namespace ash