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This change:
1) Removes some stub code that was trying to disable a test
2) Fixes SwitchTabsMac on 10.14+, where SendGlobalKeyEventsAndWait CHECKs

Bug: 852232
Change-Id: I304c12488de83dcf6c361018f359c776a23cf1d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762485
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689173}