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If this is not done, when the button's visual state changes, its text
color changes but its background does not. For prominent buttons the
result is very hard to read.

Bug: 1109798
Change-Id: Id00c1cc7d9ec7c5a71ac5e4f72949883497ab025
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321056
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792800}