GitLab

According to UX spec, check icon shown on the right side of a11y
detailed view is 28994F. This change is important in terms of color
contrast.

TEST=manual
BUG=899162

Change-Id: Idd32cbf94d974355a6229ef7bb88e9ae714ab97c
Reviewed-on: https://chromium-review.googlesource.com/c/1304284Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603764}