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The test fast/events/mouse-cursor-image-set.html is flaky on Mac 10.12
Tests builder. e.g.
https://ci.chromium.org/p/chromium/builders/ci/Mac10.12%20Tests/38366.

BUG=1137716
TBR=tkent@chromium.org

Change-Id: Ib4d284ed30a1e1968ca02fef85ffe2690fd5c478
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2467577Reviewed-by: Maggie Cai <mxcai@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816496}