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This class is meant to parse the JSON of the connector policies and
give a clean abstraction to get settings and to eventually cache these
settings.

Change-Id: I7b15dddc36a0a8727c26cd5421eec04e3fdde2a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2147874Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#761953}