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I also reduced the wait time in the optional dimensions for mac_10.14 bot
from 10 minutes to 5 since I was adding the additional dimension to
(possibly) wait for.

Bug: 968531
Change-Id: Icc7e224c7e7c7fdc72258c9fb898f06d781b4538
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1636557Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665709}