[autofill in devtools]: Enable feature by default after 1 week at 50% stable.

UMA: https://uma.googleplex.com/p/chrome/timeline_v2/?sid=8d5883421b2ab31aaab9b9cebbabf1de

Reported by developer: https://bugs.chromium.org/p/chromium/issues/detail?id=1444973&q=component%3APlatform%3EDevTools

This is not a bug but a feature polishing request

Bug: 1399414
Change-Id: I2cbd62eee3318d3998758121eb0d3afe33e88314
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4533435


Reviewed-by: Norge Vizcay <vizcay@google.com>
Reviewed-by: Florian Leimgruber <fleimgruber@google.com>
Reviewed-by: Danil Somsikov <dsv@chromium.org>
Commit-Queue: Bruno Braga <brunobraga@google.com>
Cr-Commit-Position: refs/heads/main@{#1148384}