Add another slow IDL test to MSANExpectations

Bug: 856601
Change-Id: Ic16d0527736d4b0bc5aa05f4a168cbb857c67485
TBR: robertma@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788137Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693852}

third_party/blink/web_tests/MSANExpectations

@@ -353,6 +353,7 @@ crbug.com/856601 [ Linux ] external/wpt/fetch/api/idlharness.any.sharedworker.ht
 crbug.com/856601 [ Linux ] external/wpt/generic-sensor/idlharness.https.window.html [ Pass Timeout ]
 crbug.com/856601 [ Linux ] external/wpt/html-media-capture/idlharness.window.html [ Pass Timeout ]
 crbug.com/856601 [ Linux ] external/wpt/pointerlock/idlharness.window.html [ Pass Timeout ]
+crbug.com/856601 [ Linux ] virtual/blink-cors/external/wpt/fetch/api/idlharness.any.html [ Pass Timeout ]
 crbug.com/856601 [ Linux ] virtual/blink-cors/external/wpt/fetch/api/idlharness.any.sharedworker.html [ Pass Timeout ]
 crbug.com/856601 [ Linux ] virtual/blink-cors/external/wpt/fetch/cors-rfc1918/idlharness.tentative.any.sharedworker.html [ Pass Timeout ]
 crbug.com/856601 [ Linux ] virtual/omt-worker-fetch/external/wpt/fetch/cors-rfc1918/idlharness.tentative.any.worker.html [ Pass Timeout ]