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This allows us to use the hashes as value types with convenient
assignment and comparison operators.

Also add myself as owner of the third_party_dlls subdirectory as
pennymac@chromium.org no longer works on Chrome.

Change-Id: I66838fd4890637bf53faa22fbcbbfcae6456b583
Reviewed-on: https://chromium-review.googlesource.com/c/1340967Reviewed-by: Cait Phillips <caitkp@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609374}