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Screenshot: https://screenshot.googleplex.com/8NAe4DWRAsTKipU
Design: go/switch-access-setup-ux-select-switch

AX-Relnotes: In Switch Access, disallow removal of select switch if it's the only one remaining, to prevent users from getting into a bad state.
Fixed: 1157268
Change-Id: I69358685f8cf389675875a1558c71591a6e6e921
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2583150
Commit-Queue: Josiah Krutz <josiahk@google.com>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836048}