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The assigned machine is in mac 10.14 so os can't be os.MAC_10_15. This
is to fix the infra failures caused by this wrong config.

bug: 1085198
Change-Id: Ia8a64508045f3fb7ee8b021d61f97faf7755ecba
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2211043
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770800}