cros: Fix update user list when secondary screen is running

Bug: 1045311
Change-Id: I14518db877a9482bf3b5a37a34320c705e8b92fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020959Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735542}

chrome/browser/chromeos/login/existing_user_controller.cc

@@ -1300,7 +1300,12 @@ void ExistingUserController::DeviceSettingsChanged() {
   if (!profile_prepared_ && GetLoginDisplay() &&
       !GetLoginDisplay()->is_signin_completed()) {
     // Signed settings or user list changed. Notify views and update them.
-    UpdateLoginDisplay(user_manager::UserManager::Get()->GetUsers());
+    const user_manager::UserList& users =
+        UserAddingScreen::Get()->IsRunning()
+            ? user_manager::UserManager::Get()->GetUsersAllowedForMultiProfile()
+            : user_manager::UserManager::Get()->GetUsers();
+
+    UpdateLoginDisplay(users);
     ConfigureAutoLogin();
   }
 }