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This Cl adds support for fine-grained time zone detection to settings UI.

Bug: 721578
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I2788dc9681451dd3abcb95b647866132d67c87c6
Reviewed-on: https://chromium-review.googlesource.com/768471
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517710}