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Uses well-known public key for verification.
For the time being only DEV key is verified.

Bug: b:170054326
Bug: b:177569962
Change-Id: I16c2b9c730f1dbc39a725c958a284863d55921d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630426Reviewed-by: Zach Trudo <zatrudo@google.com>
Commit-Queue: Leonid Baraz <lbaraz@chromium.org>
Auto-Submit: Leonid Baraz <lbaraz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843802}