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This change prepares base::win::i18n for the base::string16 switch and
cleans up LanguageSelectors' interface and implementation by e.g.
replacing a pair of pointers with a base::span.

Bug: 911896
Change-Id: If02538532908c1ea1e92044fc9f37176c085f3f5
Reviewed-on: https://chromium-review.googlesource.com/c/1437210
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Roger Tawa <rogerta@chromium.org>
Auto-Submit: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626663}