ash: Merge LoginStatus update code path

ash/shell/example_session_controller_client.cc

 // Copyright 2017 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/shell/example_session_controller_client.h"
 
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
 #include "base/logging.h"
 
@@ skipping 18 matching lines @@
   DCHECK_EQ(instance, this);
   instance = nullptr;
 }
 
 // static
 ExampleSessionControllerClient* ExampleSessionControllerClient::Get() {
   return instance;
 }
 
 void ExampleSessionControllerClient::Initialize() {
+  InitializeAndBind();

[msw, 2017/04/05 00:15:47]

nit: add a comment?

[xiyuan, 2017/04/05 22:29:07]

Done.

   // ash_shell has 2 users.
   CreatePredefinedUserSessions(2);
 }
 
 void ExampleSessionControllerClient::RequestLockScreen() {
   TestSessionControllerClient::RequestLockScreen();
   shell::CreateLockScreen();
   Shell::GetInstance()->UpdateShelfVisibility();
 }
 
 void ExampleSessionControllerClient::UnlockScreen() {
   TestSessionControllerClient::UnlockScreen();
   Shell::GetInstance()->UpdateShelfVisibility();
 }
 
 }  // namespace shell
 }  // namespace ash