Warn in the DevTools console for TLS 1.0 and 1.1.

TLS 1.0 and 1.1 are deprecated. See:
https://security.googleblog.com/2018/10/modernizing-transport-security.html
https://groups.google.com/a/chromium.org/d/msg/blink-dev/EHSnAn2rucg/oiu0DoQ0CAAJ

As part of that deprecation, show a console warning in DevTools and also
add a Blink-level UseCounter. (We typically measure things at the
connection or request level for network features, but since we're
plumbing this in anyway, go ahead and add one.) I mirrored the plumbing
and UseCounters for Symantec certificates.

Bug: 896013
Change-Id: I9b45e6264a2119b7b68a5a9f282dfd63a372210a
Reviewed-on: https://chromium-review.googlesource.com/c/1324878
Commit-Queue: David Benjamin <davidben@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608456}
24 files changed