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This can be used in testing so it's easy to test with
CertVerifierBuiltin without setting up a local finch instances.

Also promote logging of chosen cert verifier to VLOG(0) so it's visibe
in test logs and potentially also if a user reports cert verification
errors,

                    --force-cert-verifier-builtin
      (watch log output for chosen cert verifier)

Bug: 978069
Test: browser_tests --gtest_filter=*SSLUITest* \
Change-Id: I74981fa0a2aecb94b7eab129ab5da155f18847a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1715348Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680164}