cros oobe: Remove Guest mode observer from wizard controller.

Covered by existing_user_controller observer.

Bug: none
Test: LoginScreenGuestButtonPolicyTest.*
Change-Id: I9d99a05b5b6e1ac7de08a848a426caafb79c9bde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231059
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Auto-Submit: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775113}

chrome/browser/chromeos/login/wizard_controller.cc

@@ -15,7 +15,6 @@
 #include <vector>
 
 #include "ash/public/cpp/ash_switches.h"
-#include "ash/public/cpp/login_screen.h"
 #include "ash/public/cpp/tablet_mode.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ -165,7 +164,6 @@
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/session_manager/core/session_manager.h"
-#include "components/user_manager/user_manager.h"
 #include "content/public/browser/browser_task_traits.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_types.h"
@@ -400,12 +398,6 @@ void WizardController::Init(OobeScreenId first_screen) {
                          weak_factory_.GetWeakPtr()));
     }
   }
-  if (CrosSettings::IsInitialized()) {
-    guest_mode_policy_subscription_ = CrosSettings::Get()->AddSettingsObserver(
-        kAccountsPrefAllowGuest,
-        base::BindRepeating(&WizardController::OnGuestModePolicyUpdated,
-                            weak_factory_.GetWeakPtr()));
-  }
 
   // Use the saved screen preference from Local State.
   const std::string screen_pref =
@@ -1614,11 +1606,6 @@ void WizardController::OnAccessibilityStatusChanged(
   }
 }
 
-void WizardController::OnGuestModePolicyUpdated() {
-  ash::LoginScreen::Get()->SetAllowLoginAsGuest(
-      user_manager::UserManager::Get()->IsGuestSessionAllowed());
-}
-
 void WizardController::AutoLaunchKioskApp(KioskAppType app_type) {
   KioskAppId kiosk_app_id;
   switch (app_type) {

chrome/browser/chromeos/login/wizard_controller.h

@@ -41,7 +41,6 @@
 #include "chrome/browser/chromeos/login/screens/terms_of_service_screen.h"
 #include "chrome/browser/chromeos/login/screens/update_screen.h"
 #include "chrome/browser/chromeos/policy/enrollment_config.h"
-#include "chrome/browser/chromeos/settings/cros_settings.h"
 
 class PrefService;
 
@@ -280,9 +279,6 @@ class WizardController {
   void OnAccessibilityStatusChanged(
       const AccessibilityStatusEventDetails& details);
 
-  // Notification of Guest Mode policy changes.
-  void OnGuestModePolicyUpdated();
-
   // Switches from one screen to another.
   void SetCurrentScreen(BaseScreen* screen);
 
@@ -402,8 +398,6 @@ class WizardController {
   friend class WizardControllerSupervisionTransitionOobeTest;
 
   std::unique_ptr<AccessibilityStatusSubscription> accessibility_subscription_;
-  std::unique_ptr<CrosSettings::ObserverSubscription>
-      guest_mode_policy_subscription_;
 
   std::unique_ptr<SimpleGeolocationProvider> geolocation_provider_;
   std::unique_ptr<TimeZoneProvider> timezone_provider_;