GitLab

<button> is type="submit" by default. Adding type="button" will prevent
the Cancel and Delete buttons from triggering the "submit" event.

Bug: 874018
Change-Id: Ie72ec07ddbaeccee29588612fc8938f268150f20
Reviewed-on: https://chromium-review.googlesource.com/1174804
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583441}