Add device policy to disallow shutdown - ash UI modifications

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

 // Copyright (c) 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 "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/shell.h"
@@ skipping 1010 matching lines @@
   args->GetString(0, &email);
 
   gaia_screen_handler_->PopulateEmail(email);
   // Load auth extension. Parameters are: force reload, do not load extension in
   // background, use offline version.
   gaia_screen_handler_->LoadAuthExtension(true, false, true);
   UpdateUIState(UI_STATE_GAIA_SIGNIN, NULL);
 }
 
 void SigninScreenHandler::HandleShutdownSystem() {
-  ash::Shell::GetInstance()->lock_state_controller()->RequestShutdown(
-      ash::LockStateController::POWER_OFF);
+  ash::Shell::GetInstance()->lock_state_controller()->RequestShutdown();
 }
 
 void SigninScreenHandler::HandleLoadWallpaper(const std::string& email) {
   if (delegate_)
     delegate_->LoadWallpaper(email);
 }
 
 void SigninScreenHandler::HandleRebootSystem() {
   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RequestRestart();
 }
@@ skipping 339 matching lines @@
   return gaia_screen_handler_->frame_error();
 }
 
 void SigninScreenHandler::OnCapsLockChanged(bool enabled) {
   caps_lock_enabled_ = enabled;
   if (page_is_ready())
     CallJS("login.AccountPickerScreen.setCapsLockState", caps_lock_enabled_);
 }
 
 }  // namespace chromeos