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Most consumers of ConnectionInfo do not actually need the full level of
detail provided by that enum, merely the name of the protocol used.
This change allows us to add new QUIC versions without updating all call
sites that are not interested in the specific QUIC version used.

R=rch@chromium.org

Change-Id: I831d3bd3a704f8f2936773a726ac50b6a80d2580
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862122Reviewed-by: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Victor Vasiliev <vasilvv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708339}