[Kiosk] Fix flaky KioskTest.LaunchAppUserCancel

This test was flaky because sometimes it was going to the network
confingure screen(because there was no network), now we are always
online.

Bug: 964333
Change-Id: I397a873e7a0393a5646993475b934f226661e9c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352889Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797658}

chrome/browser/chromeos/login/kiosk_browsertest.cc

@@ -1035,13 +1035,12 @@ IN_PROC_BROWSER_TEST_F(KioskTest, LaunchAppNetworkPortal) {
   WaitForAppLaunchSuccess();
 }
 
-// TODO(https://crbug.com/964333): Flakily seg faults.
-IN_PROC_BROWSER_TEST_F(KioskTest, DISABLED_LaunchAppUserCancel) {
-  // Make fake_cws_ return empty update response.
-  set_test_app_version("");
-  OobeScreenWaiter splash_waiter(AppLaunchSplashScreenView::kScreenId);
+IN_PROC_BROWSER_TEST_F(KioskTest, LaunchAppUserCancel) {
   StartAppLaunchFromLoginScreen(
-      NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_OFFLINE);
+      NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_ONLINE);
+  OobeScreenWaiter splash_waiter(AppLaunchSplashScreenView::kScreenId);
+  // Do not let the app be run to avoid race condition.
+  BlockAppLaunch(true);
   splash_waiter.Wait();
 
   settings_helper_.SetBoolean(