[M106][OOBE]: Enable network portal detector after accepting EULA

(cherry picked from commit d7a3d08)

Bug: b:239935283
Change-Id: I83798e4cc35fd072f907af3864c5afa3e382fd95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3838817
Reviewed-by: Roman Sorokin <rsorokin@google.com>
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1037159}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3845390
Reviewed-by: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/branch-heads/5249@{#38}
Cr-Branched-From: 4f7bea5-refs/heads/main@{#1036826}

chrome/browser/ash/login/screens/consolidated_consent_screen.cc

@@ -36,6 +36,7 @@
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
+#include "chromeos/ash/components/network/portal_detector/network_portal_detector.h"
 #include "components/consent_auditor/consent_auditor.h"
 #include "components/metrics/metrics_service.h"
 #include "components/prefs/pref_service.h"
@@ -406,6 +407,7 @@ void ConsolidatedConsentScreen::OnAccept(bool enable_stats_usage,
 
 void ConsolidatedConsentScreen::ExitScreenWithAcceptedResult() {
   StartupUtils::MarkEulaAccepted();
+  network_portal_detector::GetInstance()->Enable();
 
   const DemoSetupController* const demo_setup_controller =
       WizardController::default_controller()->demo_setup_controller();

chrome/browser/ash/login/session/user_session_manager.cc

@@ -492,6 +492,7 @@ bool MaybeShowNewTermsAfterUpdateToFlex(Profile* profile) {
   bool is_device_managed = connector->IsDeviceEnterpriseManaged();
   if (is_device_managed) {
     StartupUtils::MarkEulaAccepted();
+    network_portal_detector::GetInstance()->Enable();
     return false;
   }
   if (!IsRevenUpdatedToFlex())