Disable flakey external/wpt/permissions-revoke/idlharness.any.worker.html.

TBR=kyleju@chromium.org

Bug: 1047818
Change-Id: I1a3d001dbb3f901044dc084afc45b0915d80ffc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080557Reviewed-by: Chris Mumford <cmumford@google.com>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#745670}

third_party/blink/web_tests/MSANExpectations

@@ -390,3 +390,6 @@ crbug.com/856601 [ Linux ] external/wpt/badging/idlharness.https.any.html [ Pass
 
 # Sheriff 2020-02-20
 crbug.com/856601 [ Linux ] external/wpt/badging/idlharness.https.any.worker.html [ Pass Timeout ]
+
+# Sheriff 2020-02-28
+crbug.com/1047818 [ Linux ] external/wpt/permissions-revoke/idlharness.any.worker.html [ Pass Timeout ]