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This CL implements CrowdDenyComponentInstaller, defines the Protobuf
definition of the payload, and adds some plumbing to read the payload
from the disk and store it in the CrowdDenyPreloadData singleton.

Bug: 1028642
Change-Id: Ie0f296784d83b398f4e9732ed85072b9e71f5772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937174Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720250}