Unwind the SSL version interference probe.

This takes away one source of SSLConfig variation. We can instead put it
back in SSLConnectJob (the flattened socket pools should avoid the NTLM
bug), but no point when we don't need it anymore. TLS 1.3 has been
shipping for over a year now, and the admin policy expired in M75. Per
chrome/VERSION, trunk is now M76.

This CL does not change whether connections with TLS-1.3-intolerant
networks or servers fail. It only shifts the error back to
ERR_SSL_PROTOCOL_ERROR, ERR_CONNECTION_RESET, or whatever we actually
get out of the server.

Bug: 951205
Change-Id: I95f1730c7b835c9aab1998c0cda56bcfaca45e1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574368
Commit-Queue: David Benjamin <davidben@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653359}
19 files changed