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This CL rolls QUICHE to include two changes:
Legacy Version Encapsulation, and a fix to
ParseQuicTagVector. It additionally adds the
support required for Legacy Version
Encapsulation to work, and adds a command-line
flag that allows us to test it. This CL also
removes quic_utils_chromium since every method
in it has now been moved to QUICHE.

R=renjietang@chromium.org

Change-Id: Iac2423df461656a47398f4579c279a22254390e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261103
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Reviewed-by: Renjie Tang <renjietang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781645}