chromeos: Migrate SignOut and RequestRestartForUpdate to mojo interface

ash/common/test/test_system_tray_delegate.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/common/test/test_system_tray_delegate.h"
 
 #include <string>
 
 #include "ash/common/login_status.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm_shell.h"
-#include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 
 namespace ash {
 namespace test {
 
 namespace {
 
 bool g_system_update_required = false;
 LoginStatus g_initial_status = LoginStatus::USER;
 
@@ skipping 70 matching lines @@
   return session_length_limit_set_;
 }
 
 bool TestSystemTrayDelegate::GetSessionLengthLimit(
     base::TimeDelta* session_length_limit) {
   if (session_length_limit_set_)
     *session_length_limit = session_length_limit_;
   return session_length_limit_set_;
 }
 
-void TestSystemTrayDelegate::SignOut() {
-  base::MessageLoop::current()->QuitWhenIdle();
-}
-
 void TestSystemTrayDelegate::GetCurrentIME(IMEInfo* info) {
   *info = current_ime_;
 }
 
 void TestSystemTrayDelegate::GetAvailableIMEList(IMEInfoList* list) {
   *list = ime_list_;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 ScopedInitialLoginStatus::ScopedInitialLoginStatus(LoginStatus new_status)
     : old_status_(g_initial_status) {
   g_initial_status = new_status;
 }
 
 ScopedInitialLoginStatus::~ScopedInitialLoginStatus() {
   g_initial_status = old_status_;
 }
 
 }  // namespace test
 }  // namespace ash