[FedCM] Only compare origins, not paths, for CSP checks

For compatibility with existing deployments, only compare origins.

This has been discussed and agreed with Chrome Security in
https://docs.google.com/document/d/16OwWXqg4tueno7xkQU7TPrF-qJle3KFqRUMHCFQ3rug/edit

Fixed: 1320724
Change-Id: I2758727149757cef835cd10b4c4d04897f234098
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3630577
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: Antonio Sartori <antoniosartori@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1002743}
diff --git a/credential-management/fedcm.https.html.headers b/credential-management/fedcm.https.html.headers
index e907cdd..408f782 100644
--- a/credential-management/fedcm.https.html.headers
+++ b/credential-management/fedcm.https.html.headers
@@ -1 +1 @@
-Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline'; connect-src https://idp.test
+Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline'; connect-src https://idp.test/never/used/path