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Original author: amoylan@chromium.org
Original cl: https://chromium-review.googlesource.com/c/chromium/src/+/706439

This CL adds the GeoLanguageProvider browser singleton as described in
the design doc:
https://docs.google.com/document/d/18WqVHz5F9vaUiE32E8Ge6QHmku2QSJKvlqB9JjnIM-g

This interface provides a list of language codes corresponding to local
languages based on the device's approximate geolocation derived from
its public IP address, using the PublicIpAddressGeolocator service.
IP geolocation updates are requested no more often than every 24 hours.

This singleton is started up after Profile init in
PreMainMessageLoopRun. The startup runs on a background task runner,
connecting & subscribing to the IP geolocation service. Startup is gated
on the Feature setting "GeoLanguage" which is false for now.

Bug: 76915
Change-Id: I9af2b1375fabda3d029ca396043b9195acab7cf0
Reviewed-on: https://chromium-review.googlesource.com/807884
Commit-Queue: Renjie Liu <renjieliu@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523709}