Make one week certificate memory the default.
This CL changes the default setting for certificate memory so that
instead of remembering a user's decision to proceed through a bad
certificate until session restart, it will be remembered for one week
(including across session restarts). Notably, this CL does not remove
the flags or current experiment; it just makes one week memory the
default.
BUG=487270
Review URL: https://codereview.chromium.org/
1150083004
Cr-Commit-Position: refs/heads/master@{#332015}