[Sheriff] Disable flaky external/wpt/html/cross-origin-embedder-policy/blob.https.html

TBR=foolip

Bug: 1042681
Change-Id: I6f44287a5774774deabe7ccc35f3f2ce7e3608a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003131Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732393}

third_party/blink/web_tests/TestExpectations

@@ -6394,3 +6394,6 @@ virtual/omt-worker-fetch/http/tests/origin_trials/sample-api-script-added-after-
 # ecosystem-infra sheriff 2020-01-15
 # Has non-deterministic output on failure, so cannot match -expected.txt
 crbug.com/1042347 external/wpt/html/cross-origin-opener-policy/blob-popup.https.html [ Failure ]
+
+# Sheriff 2020-01-16
+crbug.com/1042681 external/wpt/html/cross-origin-embedder-policy/blob.https.html [ Pass Failure ]