[FedCM] Enable FedCmSkipWellKnownForSameSite by default

This skips the .well-known/web-identity checks if the RP and
IDP are in the same eTLD+1.

Approved by security and privacy in:
https://docs.google.com/document/d/1zTJVmW-zAm-pFeLIGV0IhInXVlLwSh9rz08E5QVy4NA/edit?resourcekey=0-LGYUJlxuj15i4phyz46nvQ

Bug: 1511767
Change-Id: I44ee15feb11354c4b58bfab74e69b7d4af97da87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5177812
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: Christian Biesinger <cbiesinger@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1244800}
diff --git a/credential-management/fedcm-manifest-not-in-list.https.html b/credential-management/fedcm-manifest-not-in-list.https.html
index 8d85d9e..087af38 100644
--- a/credential-management/fedcm-manifest-not-in-list.https.html
+++ b/credential-management/fedcm-manifest-not-in-list.https.html
@@ -7,12 +7,12 @@
 <script src="/resources/testdriver-vendor.js"></script>
 
 <script type="module">
-import {request_options_with_mediation_required,
+import {alt_request_options_with_mediation_required,
         fedcm_test,
         fedcm_get_and_select_first_account} from './support/fedcm-helper.sub.js';
 
 fedcm_test(async t => {
-  let test_options = request_options_with_mediation_required('manifest-not-in-list.json');
+  let test_options = alt_request_options_with_mediation_required('manifest-not-in-list.json');
   const cred = fedcm_get_and_select_first_account(t, test_options);
   return promise_rejects_dom(t, 'NetworkError', cred);
 }, 'Test that the promise is rejected if the manifest is not in the manifest list');