mustash: Convert TraySupervisedUserTest to AshTest

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"
@@ skipping 10 matching lines @@
 LoginStatus g_initial_status = LoginStatus::USER;
 
 }  // namespace
 
 TestSystemTrayDelegate::TestSystemTrayDelegate()
     : login_status_(g_initial_status), session_length_limit_set_(false) {}
 
 TestSystemTrayDelegate::~TestSystemTrayDelegate() {}
 
 // static
-void TestSystemTrayDelegate::SetInitialLoginStatus(LoginStatus login_status) {
-  g_initial_status = login_status;
-}
-
-// static
 void TestSystemTrayDelegate::SetSystemUpdateRequired(bool required) {
   g_system_update_required = required;
 }
 
 void TestSystemTrayDelegate::SetLoginStatus(LoginStatus login_status) {
   login_status_ = login_status;
   WmShell::Get()->UpdateAfterLoginStatusChange(login_status);
 }
 
 void TestSystemTrayDelegate::SetSessionLengthLimitForTest(
@@ skipping 64 matching lines @@
 }
 
 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