Support filling PSL matches on http domains.

Before this CL, the plus address affiliation matcher assumed no support
of http domains (i.e. invalid facets; See removed DCHECKs).

Nevertheless, filling did not fail on PSL matched http domains. This CL
removes the preconditions and includes a tests that asserts the correct
behaviour.

Note that filling http domains that are part of the group affiliation is
not supported yet. This will be included on follow-up CLs.

Bug: 361308219
Change-Id: I9f2f02f7fc4cc0849c38017154c983de7cd160be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5809160
Commit-Queue: Norge Vizcay <vizcay@google.com>
Reviewed-by: Jan Keitel <jkeitel@google.com>
Cr-Commit-Position: refs/heads/main@{#1346720}