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This reverts commit 75ffb181.

Reason for revert: static initializer in about_flags.cc, see https://ci.chromium.org/buildbot/chromium.chrome/Google%20Chrome%20Linux%20x64/37607

Original change's description:
> Add Finch param to control TLS 1.3 Downgrade enforcement on known/unknown roots.
> 
> Change-Id: I88932442b714820944b4608e106eaf47536bf00d
> Reviewed-on: https://chromium-review.googlesource.com/c/1329344
> Commit-Queue: Steven Valdez <svaldez@chromium.org>
> Reviewed-by: David Benjamin <davidben@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#607712}

TBR=davidben@chromium.org,svaldez@chromium.org

Change-Id: I638f9065d117b2885fa947c343234981eacfb991
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1334412Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607763}