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The machines have successfully upgraded to Mac 10.15, so we're
setting the OS dimension accordingly.

Bug: 1135264
Change-Id: Ie1bcf9e434e75510a673f93ac430474c5fbcf7a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450896
Auto-Submit: Jeff Yoon <jeffyoon@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814278}