Button: reset UA focus-visible style for the host element
Button: reset UA focus-visible style for the host element

The browser puts a blue outline by default which we don't
need because the internal button handles the focus
styles already.

Drive-by: fix the border in :active and :focus-visible states
to avoid a white border.

Bug: none
Change-Id: I13d1076592d13e468c12a4053df0155ce7137b2b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3195731
Commit-Queue: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

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