Use same focus color for all Shelf buttons

Focus color for shelf items was changed in this CL:
https://chromium-review.googlesource.com/c/chromium/src/+/1559132
However, some login shelf buttons were left out.

Bug: 963407
Change-Id: Ib82531d59caddaac30acdb91f7af213a6267ed3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1629181
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663311}
1 file changed