[web tests] Update expectation for AddEventListenerOptions-signal.any test

AddEventListenerOptions-signal.any is failing on Linux Leak bots

TBR=smcgruer@chromium.org

Bug: 1155771
Change-Id: I6ed11b1f9ad413331a71fac1e85017788eae399b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575901Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833973}

third_party/blink/web_tests/TestExpectations

@@ -5917,3 +5917,7 @@ crbug.com/1032681 virtual/disable-frequency-capping-for-overlay-popup-detection/
 # Sheriff 2020-12-03
 crbug.com/1154940 [ Win7 ] inspector-protocol/overlay/overlay-persistent-overlays-with-emulation.js [ Pass Failure ]
 crbug.com/1155125 [ Linux ] http/tests/history/replacestate-post-to-get-2.html [ Pass Timeout ]
+
+# Sheriff 2020-12-04
+# Failing on Webkit Linux Leak
+crbug.com/1155771 [ Linux ] external/wpt/dom/events/AddEventListenerOptions-signal.any.html [ Pass Failure ]