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This change loads the model from the file provided by the Opt Guide and
returns it via callback to any requestor of the model.

A future change will provide the model to the content translate driver
and the translate agent via mojo.

Bug: 1151406
Change-Id: If09871f3ad04a674d964a467586cfb0f24fd4708
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593589Reviewed-by: Trevor  Perrier <perrier@chromium.org>
Reviewed-by: Scott Little <sclittle@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837751}