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With this CL, the split between Verifier and VerifierDelegate is more
strict. The Verifier keeps the current verification state and triggers
verification when necessary and the VerifierDelegate deals with
everything else (specifically whether we should perform full
verification or just check the cache, and what scope the verification
is relevant for).

Bug: 1018672
Change-Id: I92608eb4a7dfb8aa526679d0bb678847c63f4f97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893852
Commit-Queue: Peter Conn <peconn@chromium.org>
Reviewed-by: Pavel Shmakov <pshmakov@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712170}