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It is now only set in tests, where it is a largely a no-op because False
Start since acquired an ALPN requirement. When False Start is triggered,
we do need to worry about post-Connect() handshake data and sessions
being established late, but TLS 1.3 has the same problem unavoidably.

Abstract the ticket-forcing logic behind a new helper so we can easily
add it as needed in the future.

(Firefox actually no longer requires ALPN for False Start. This may be
worth considering, in which case we may need to revisit some more of
these tests. Additionally, SpawnedTestServer doesn't support TLS 1.3 and
most of these tests haven't moved to EmbeddedTestServer, which may also
require fixing up tests.)

Bug: none
Change-Id: I444ee12b66aed88898d1492ee0df29817c155348
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708675
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686506}