Credential Manager: Align 'FederatedCredential' with the spec.

LayoutTests/http/tests/credentialmanager/credentialscontainer-notifyfailedsignin-basics.html

Index: LayoutTests/http/tests/credentialmanager/credentialscontainer-notifyfailedsignin-basics.html
diff --git a/LayoutTests/http/tests/credentialmanager/credentialscontainer-notifyfailedsignin-basics.html b/LayoutTests/http/tests/credentialmanager/credentialscontainer-notifyfailedsignin-basics.html
index 42c9c352c61dc8a673caed9c296fb6799eaa8241..395473981134421967d8ff70e6d7371bd7061743 100644
--- a/LayoutTests/http/tests/credentialmanager/credentialscontainer-notifyfailedsignin-basics.html
+++ b/LayoutTests/http/tests/credentialmanager/credentialscontainer-notifyfailedsignin-basics.html
@@ -13,7 +13,12 @@ function stubRejectionChecker(reason) {
 }
 
 var local = new LocalCredential('id', 'pencil', 'name', 'https://example.com/avatar.png');
-var federated = new FederatedCredential('id', 'https://federation.net', 'name', 'https://example.com/avatar.png');
+var federated = new FederatedCredential({
+    'id': 'id',
+    'provider': 'https://federation.test/',
+    'name': 'name',
+    'iconURL': 'https://example.test/icon.png'
+});
 
 async_test(function () {
     navigator.credentials.notifyFailedSignIn().then(