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Mojave users might have already granted a11y permission to the old
helper script. In order not to unnecessarily break them, this CL
implements a fallback logic in the host service executable to always
delegate to the old script if the script exists and the user is on
macOS 10.14.

Bug: 10142116
Change-Id: I301585cf25ca3c37ac1ebedac8b4dee6c1251c0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1861278Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706026}