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Update "Mac FYI dEQP Release AMD" on the GPU FYI waterfall to look for
machines running OS 10.13.6.

Bug: chromium:881952
No-Try: True
Change-Id: I12e0f82f4cc29fdbe36f7f76ad5d945228eaf4a7
Reviewed-on: https://chromium-review.googlesource.com/1213704
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589685}