Chrome OS SyncConsentTest: verify language switching.

This CL adds checks for SyncConsent screen in different languages to
catch bugs like the one below.

Bug: 910510
Change-Id: If09130926b77b0a515e439940c26e2be2a49f0a3
Reviewed-on: https://chromium-review.googlesource.com/c/1366283
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615320}
2 files changed