GitLab

Enable this experiment flag by default in preparation for enabling it on
stable via Finch.

Extend the expiry of the related metric so that it keeps collecting data
until after the default-enabling has reached stable.

Bug: 1038002
Change-Id: Ieae23184ab430565df775c1aad4112dc63ae1561
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477155Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817692}