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This CL improves the fuzzer coverage of ParsedCookie's mutator methods
(SetName, SetValue, etc.). It also adds a check for the property that
serializing, deserializing, and then reserializing a valid cookie
produces the same cookie line both times.

Change-Id: If2db605195daf2a7e77a8dded4b391281eb83c21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643754Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Dan McArdle <dmcardle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666287}