Disable flaky tests for linux-chromeos-dbg

ActiveDirectoryJoinTest.TestActiveDirectoryEnrollment_UIErrors
OsInstallScreenTest.OsInstallSuccessAutoShutdown

Bug: 1318903
Change-Id: I18cca2ee19812758efdd5b97e4f7faa131f3ad13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3600803
Reviewed-by: Lei Zhang <thestig@chromium.org>
Owners-Override: Liviu Tinta <liviutinta@chromium.org>
Commit-Queue: Liviu Tinta <liviutinta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#995250}

chrome/browser/ash/login/enterprise_enrollment_browsertest.cc

@@ -577,8 +577,9 @@ IN_PROC_BROWSER_TEST_F(ActiveDirectoryJoinTest,
 // Directory domain join screen. Verifies the domain join screen is displayed.
 // Submits Active Directory different incorrect credentials. Verifies that the
 // correct error is displayed.
+// TODO(crbug.com/1318903): Re-enable this test
 IN_PROC_BROWSER_TEST_F(ActiveDirectoryJoinTest,
-                       TestActiveDirectoryEnrollment_UIErrors) {
+                       DISABLED_TestActiveDirectoryEnrollment_UIErrors) {
   ShowEnrollmentScreen();
   enrollment_helper_.SetupActiveDirectoryJoin(
       enrollment_screen(), kAdUserDomain, std::string(), kDMToken);

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

@@ -221,7 +221,9 @@ IN_PROC_BROWSER_TEST_F(OsInstallScreenTest, OsInstallGenericError) {
 
 // Check that a successful install shows the success step and countdown timer,
 // which will shut down the computer automatically after 60 seconds.
-IN_PROC_BROWSER_TEST_F(OsInstallScreenTest, OsInstallSuccessAutoShutdown) {
+// TODO(crbug.com/1318903): Re-enable this test
+IN_PROC_BROWSER_TEST_F(OsInstallScreenTest,
+                       DISABLED_OsInstallSuccessAutoShutdown) {
   base::ScopedMockTimeMessageLoopTaskRunner mocked_task_runner;
   SetTickClockForTesting(mocked_task_runner->GetMockTickClock());
   auto* ti = OsInstallClient::Get()->GetTestInterface();