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In the course of preparing the Settings UI to interact with feature
prefs via the MultiDevice service, it became very cumbersome to pass
around data without some utilities common to the components. This CL
factors out some such utilities into their own behavior and passes
around feature data using the behavior

Note that this CL does not change the components' relationships with
feature prefs as that is in the next change, but the behavior is a
convenient intermediate point and should make the other significantly
easier to review/work with.

Note also that not all the components yet use the behavior but they
almost all will as it becomes more relevant over the next few CLs.

Change-Id: Iaeec623bd534287893f6c204a0fdf524ac0bfd77
Reviewed-on: https://chromium-review.googlesource.com/1179820Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584812}