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Other than BaseScrollBarButton, other subclasses of Button class in
views/ should follow Button's default focus behavior.
BaseScrollBarButton should not be focusable, nor accessible for
accessibility.
Set these default values explicitly so changing Button class's default
won't affect them.

Bug: 1001103
Change-Id: If32d8dadf69a5ba5f8d23738678e31d285d3e5ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429435
Commit-Queue: Wei Li <weili@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813451}