GitLab

There was an error in 74eb4979,
which removed this DialogDelegate's GetDialogButtons override but
didn't add a matching set_buttons call.

TBR=pbos@chromium.org

Bug: 1024761
Change-Id: I085c89d0fbaecaa442d7f8036b31ef2b17b20130
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917239Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715288}