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The method GetLanguageList() exposed by the private API returns
metadata for each available language. It is meant to be used by
all Desktop platforms, but now we need to move it into a location
that can be used by Android and iOS too.
In this change, I have moved the logic to TranslatePrefs.

Note that only the logic that is relevant to all platform has been
moved: the private API for language settings still computes the
info used by ChromeOS and Windows only.

This change does not change any Chrome behaviour.

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I648b9ed524f1c580f0a813ebf90f06b070d1530b
Reviewed-on: https://chromium-review.googlesource.com/767855
Commit-Queue: Claudio M <claudiomagni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Michael Martis <martis@chromium.org>
Reviewed-by: Leo Zhang <googleo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516978}