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As of 10.14, the API that SendGlobalKeyEventsAndWait() uses to post global
events causes a user prompt to appear, which is an obvious non-starter in test
scenarios, so disable that test for now, and add a DCHECK in
SendGlobalKeyEventsAndWait() to ensure that it is not called on 10.14.

Bug: 892177,904403
Change-Id: Ida0429d7e9914942f354690ecb657803240756ae
Reviewed-on: https://chromium-review.googlesource.com/c/1331135Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607325}