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The coverage was non-zero for CRLSet::Parse, but it appears the
fuzzers never managed to get the bottom of the function. As such,
ReadCRL had no coverage.

This CL improves the coverage by creating a new fuzzer specifically
for CRLSet::Parse with a seed corpus. I just grabbed files from
net/data/ssl/certificates/ that contained "crl" in their name -- this
was enough to get the fuzzer to venture into ReadCRL.

Change-Id: I67618a448b23c36313ea7c8df09536529522075c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643908Reviewed-by: Ryan Sleevi <rsleevi@chromium.org>
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666008}