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Fix a11y focus-related issues on Marketing opt-in and EULA screens.

Bug: 1024092
Change-Id: Ic976091e42ed2c46324445288e2c2b794d87883e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401659
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805694}