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This change adds a base::Feature which can be enabled via command line
for integration tests to lower the age threshold for Lax-allow-unsafe
cookies from 2 minutes to 10 seconds, to avoid having tests that run
for 2 minutes in order to test behavior after Lax-allow-unsafe expires.

Bug: 1007489
Change-Id: I7ecc29f1ad970e391a8cf8abae220fed292877a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833705Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702169}