[sheriff] Disable KioskAppManagerTest.UpdateAndRemoveApp test as flaky

https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome
Sample run:
https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome/3317
Logs:
https://logs.chromium.org/logs/chrome/buildbucket/cr-buildbucket.appspot.com/8888037310866866032/+/steps/browser_tests/0/logs/Deterministic_failure:_KioskAppManagerTest.UpdateAndRemoveApp__status_FAILURE_/0
Flakiness dashboard:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=KioskAppManagerTest.UpdateAndRemoveApp

TBR=apotapchuk@chromium.org

Bug: 1044417
Change-Id: I8d028974d8451f0f37a5445c5cda193d43559976
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062343
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742584}

chrome/browser/chromeos/app_mode/kiosk_app_manager_browsertest.cc

@@ -761,7 +761,8 @@ IN_PROC_BROWSER_TEST_F(KioskAppManagerTest, UpdateApp) {
   EXPECT_TRUE(base::ContentsEqual(v2_file_path, new_crx_path));
 }
 
-IN_PROC_BROWSER_TEST_F(KioskAppManagerTest, UpdateAndRemoveApp) {
+// Test is flaky: https://crbug.com/1044417
+IN_PROC_BROWSER_TEST_F(KioskAppManagerTest, DISABLED_UpdateAndRemoveApp) {
   // Add a version 1 app first.
   RunAddNewAppTest(kTestLocalFsKioskApp, "1.0.0", kTestLocalFsKioskAppName, "");
   KioskAppManager::AppList apps;