Mark fast/events/mouse-cursor-image-set.html as crashing

Bug: 1113521
Change-Id: I2eb4e2dfbe5de5d6b46ec1d22815cf014e90ec15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347979
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796890}

third_party/blink/web_tests/TestExpectations

@@ -6743,3 +6743,5 @@ crbug.com/1113791 [ Win ] media/video-zoom.html [ Pass Failure ]
 
 # Sheriff 2020-08-11
 crbug.com/1095540 virtual/threaded-prefer-compositing/fast/scrolling/resize-corner-tracking-touch.html [ Pass Failure ]
+
+crbug.com/1113521 [ Mac ] fast/events/mouse-cursor-image-set.html [ Pass Crash ]