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Feature properties whitelist and blacklist should only contain SHA-1
hashes of actual extension IDs. We can't verify whether the hash was
generated from an actual extension ID, but we can ensure that only valid
SHA-1 hashes are contained. Invalid values will cause an compile error.

Bug: none
Change-Id: I4a62d3bee9737a7c87963b7179e89ea974e12e60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1554498Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648696}