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Also, make the hash constants use constexpr.

BUG=none

Change-Id: I7abb633d8bfac35eda50f797a2bf88b1ac8f8584
Reviewed-on: https://chromium-review.googlesource.com/811527Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523623}