Reenable flaky KioskUpdateTest.LaunchOfflineEnabledAppHasUpdate

This test had the same faliure reason as others KioskUpdateTest.*'s,
which after recent reenabling did not exhibit any failures.

Bug: 949490
Change-Id: Iead5f727cf87ccba15b99ef6e3991d2eb05297ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372283Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801015}

chrome/browser/chromeos/login/app_mode/kiosk_browsertest.cc

@@ -2032,15 +2032,12 @@ IN_PROC_BROWSER_TEST_F(KioskUpdateTest, LaunchOfflineEnabledAppNoUpdate) {
   EXPECT_EQ(extensions::Manifest::EXTERNAL_PREF, GetInstalledAppLocation());
 }
 
-// TODO(crbug.com/949490): is flaky on ChromeOS rel AND deb.
-IN_PROC_BROWSER_TEST_F(KioskUpdateTest,
-                       DISABLED_PRE_LaunchOfflineEnabledAppHasUpdate) {
+IN_PROC_BROWSER_TEST_F(KioskUpdateTest, PRE_LaunchOfflineEnabledAppHasUpdate) {
   PreCacheAndLaunchApp(kTestOfflineEnabledKioskApp, "1.0.0",
                        std::string(kTestOfflineEnabledKioskApp) + "_v1.crx");
 }
 
-IN_PROC_BROWSER_TEST_F(KioskUpdateTest,
-                       DISABLED_LaunchOfflineEnabledAppHasUpdate) {
+IN_PROC_BROWSER_TEST_F(KioskUpdateTest, LaunchOfflineEnabledAppHasUpdate) {
   set_test_app_id(kTestOfflineEnabledKioskApp);
   fake_cws()->SetUpdateCrx(test_app_id(),
                            "iiigpodgfihagabpagjehoocpakbnclp.crx", "2.0.0");