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These are all straightforward replacements with
DialogDelegate::set_buttons(), where still needed. One of them was
specifying OK | CANCEL, which is the default.

Bug: 1011446
Change-Id: I8c81468bd50425091f8a330b0d4427a1b4b7874f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992520Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729852}