Fix comment in dark mode feature.

We don't want to require the feature to be on when *forcing*
dark mode.

Bug: 850098

Change-Id: Ie6a7f8e7a34e1436136664cf08db2015e69a790e
Reviewed-on: https://chromium-review.googlesource.com/1254862
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595532}
1 file changed