Stop invalidating reserve requests on http domains.

The CL fixes an issue where ReservePlusAddress calls on http domains are
considered invalid. The reason is because the FacetURI class
does not consider http domain valid facets. This means that the parsing
of server responses when this contains http facets fails.

Bug: 362237423
Change-Id: I758dc439f1f27eb8c60b9d73e574d5f1e0e1096c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5821833
Commit-Queue: Norge Vizcay <vizcay@google.com>
Reviewed-by: Jan Keitel <jkeitel@google.com>
Cr-Commit-Position: refs/heads/main@{#1347959}