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This makes these utilities easier to use from other projects, which we
plan to do in the upcoming Hardware Platform Extension API
(see crbug.com/854636).

This CL also refactors the function to get the computer manufacturer
and model so that they are available as separate strings, and adds
a number of style/lint fixes.

Bug: 874408
Change-Id: I408151cc478ccf37a0515d17d1381115b12d9122
Reviewed-on: https://chromium-review.googlesource.com/1175781Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585853}