GitLab

Use OS_CHROMEOS instead of CHROMEOS.

Bug: none
Change-Id: I4935e8577c03804621f21cebab99e2c59f788cf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713562Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680426}