Added ManagedGuestSessionAutoLaunchNotificationReduced user policy

If the added policy is set, it should close the privacy warning notification (after a few seconds) which is displayed when the managed-guest session is auto-launched.

Bug: 1060108
Change-Id: Ia824b01946065b3dbd120e0181d4b7dca9313bc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096445
Commit-Queue: Aya Elsayed <[email protected]>
Reviewed-by: Avi Drissman <[email protected]>
Reviewed-by: Sergey Poromov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#749818}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 755bb2e..447f02a 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -173,6 +173,7 @@
 #include "chrome/browser/chromeos/guest_os/guest_os_share_path.h"
 #include "chrome/browser/chromeos/kerberos/kerberos_credentials_manager.h"
 #include "chrome/browser/chromeos/login/easy_unlock/easy_unlock_service.h"
+#include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/settings/stats_reporting_controller.h"
 #include "chrome/browser/component_updater/metadata_table_chromeos.h"
 #else
@@ -720,6 +721,7 @@
   chromeos::echo_offer::RegisterPrefs(registry);
   chromeos::EnableAdbSideloadingScreen::RegisterPrefs(registry);
   chromeos::EnableDebuggingScreenHandler::RegisterPrefs(registry);
+  chromeos::ExistingUserController::RegisterLocalStatePrefs(registry);
   chromeos::FastTransitionObserver::RegisterPrefs(registry);
   chromeos::HIDDetectionScreenHandler::RegisterPrefs(registry);
   chromeos::KerberosCredentialsManager::RegisterLocalStatePrefs(registry);