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This is a reland of 71c00bee

Original change's description:
> Welcome screen: Fix language list initialization
> 
> Change ResolveLanguageListInThreadPool so that it uses AppLocale instead
> of default locale if exists.
> 
> Bug: 955397
> Change-Id: I6947dd89e297adea3fd019e38d083e45419ea282
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704098
> Reviewed-by: Alexander Alekseev <alemate@chromium.org>
> Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
> Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
> Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
> Cr-Commit-Position: refs/heads/master@{#706436}

Bug: 955397
Change-Id: I9b6bc855f0a87eadab42af14d5e3d797f77d6a57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865227
Commit-Queue: Roman Aleksandrov <raleksandrov@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707295}