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Removes the remaining overrides (which are just tests inside Views) and marks
the method not virtual. It should probably be renamed to something like just
'buttons()' at some point.

Bug: 1011446
Change-Id: I8affaf1e80d7f0c2c8245edcd419f3dab14d9472
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2075078
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745081}