Disable flaky test

Bug: 1112778
Change-Id: I781e82988f137cdf2edf01634c94510a5642fad4
Cq-Do-Not-Cancel-Tryjobs: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335756Reviewed-by: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Yu Han <yuzhehan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794728}

third_party/blink/web_tests/TestExpectations

@@ -6859,6 +6859,9 @@ crbug.com/1108423 external/wpt/referrer-policy/gen/worker-classic.http-rp/unset/
 crbug.com/1106429 virtual/percent-based-scrolling/max-percent-delta-page-zoom.html [ Pass Failure ]
 crbug.com/1112304 external/wpt/html/cross-origin-opener-policy/popup-coop-by-sw-from-coop.https.html [ Pass Timeout ]
 
+# Flaky test
+crbug.com/1112778 external/wpt/html/semantics/scripting-1/the-script-element/module/dynamic-import/alpha/base-url-worker.sub.html [ Pass Failure ]
+
 # Sheriff 2020-08-04: New wpt tests are failing
 crbug.com/1112771 external/wpt/css/css-grid/grid-definition/grid-template-columns-rows-resolved-values-001.tentative.html [ Failure ]
 crbug.com/1112771 external/wpt/css/css-grid/layout-algorithm/grid-flex-track-intrinsic-sizes-001.html [ Failure ]