Use MD-ash's auto hide behavior for arc++ windows.

chrome/browser/chromeos/login/lock/screen_locker.cc

 // Copyright 2014 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/chromeos/login/lock/screen_locker.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/common/ash_switches.h"
@@ skipping 405 matching lines @@
   if (user_manager::UserManager::Get()->IsLoggedInAsGuest()) {
     VLOG(1) << "Refusing to lock screen for guest account";
     return;
   }
 
   // If the active window is fullscreen, exit fullscreen to avoid the web page
   // or app mimicking the lock screen. Do not exit fullscreen if the shelf is
   // visible while in fullscreen because the shelf makes it harder for a web
   // page or app to mimick the lock screen.
   ash::wm::WindowState* active_window_state = ash::wm::GetActiveWindowState();
-  if (active_window_state &&
-      active_window_state->IsFullscreen() &&
-      active_window_state->hide_shelf_when_fullscreen()) {
+  if (active_window_state && active_window_state->IsFullscreen() &&
+      active_window_state->shelf_mode_in_fullscreen() ==
+          ash::wm::WindowState::SHELF_HIDDEN) {
     const ash::wm::WMEvent event(ash::wm::WM_EVENT_TOGGLE_FULLSCREEN);
     active_window_state->OnWMEvent(&event);
   }
 
   if (!screen_locker_) {
     ScreenLocker* locker =
         new ScreenLocker(user_manager::UserManager::Get()->GetUnlockUsers());
     VLOG(1) << "Created ScreenLocker " << locker;
     locker->Init();
   } else {
@@ skipping 100 matching lines @@
 
 bool ScreenLocker::IsUserLoggedIn(const AccountId& account_id) const {
   for (user_manager::User* user : users_) {
     if (user->GetAccountId() == account_id)
       return true;
   }
   return false;
 }
 
 }  // namespace chromeos