Save federated credential's signon_realm in the correct format.

components/password_manager/core/browser/password_form_manager.cc

Index: components/password_manager/core/browser/password_form_manager.cc
diff --git a/components/password_manager/core/browser/password_form_manager.cc b/components/password_manager/core/browser/password_form_manager.cc
index 4490457e521f086be707d5e3c198499421189033..482f17061da1f8dbe12d3dd55a551fe98d3df338 100644
--- a/components/password_manager/core/browser/password_form_manager.cc
+++ b/components/password_manager/core/browser/password_form_manager.cc
@@ -1153,6 +1153,8 @@ void PasswordFormManager::CreatePendingCredentials() {
     pending_credentials_.federation_origin =
         provisionally_saved_form_->federation_origin;
     pending_credentials_.icon_url = provisionally_saved_form_->icon_url;
+    // Take the correct signon_realm for federated credentials.
+    pending_credentials_.signon_realm = provisionally_saved_form_->signon_realm;
   }
 
   if (user_action_ == kUserActionOverridePassword &&