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And mark CPU class as final.

BUG=None

Change-Id: Iaf9f96f388bbeca689114cd4c935c354ba8c8b3f
Reviewed-on: https://chromium-review.googlesource.com/538638
Commit-Queue: Thiago Farina <tfarina@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480266}