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This change causes all buttons to use focus rings on platforms that use
them.

Bug: 847121
Change-Id: Ida4fba2004d03d6482fd7c4da6dd3cbb8b13a72b
Reviewed-on: https://chromium-review.googlesource.com/1163315Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581305}