GitLab

Increase the maximum allowed remaining lifetime for the
receiver's self-signed cert to 4 days.

This is being increased from 2 days because errors are
being seen in the field because of sender clocks being off.

In the future, we might find a way to warn the user that
their clock might be off, but for now just changing the
tolerance seems the right approach.

BUG=467736

R=mfoltz@chromium.org

Review URL: https://codereview.chromium.org/1011133005

Cr-Commit-Position: refs/heads/master@{#322497}