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Disk cache is, by definition, persisted, so use base::PersistentHash(),
which currently has the exact same behavior as base::Hash(), but is
actually guaranteed not to change.

Bug: 1025358
Change-Id: I43c53197d97c7781ef0fcfbacb89cdb214abc24e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1924603Reviewed-by: Maksim Orlovich <morlovich@chromium.org>
Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716939}