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This change persists the model and host model features received from a
fetch to the remote Optimization Guide Service by places them within
the store owned by the PredictionManager.

A future change will add browser tests and metrics to confirm expected
behavior of prediction manager, fetcher, and models.

Bug: 1001194
Change-Id: I705785d32560160b14f69f846f0148d3ef6abc43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934827Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719265}