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 ae16eecae59543bfa177af398cc5b0b78d5006dc..bb026d6a046e6ca57201a00801a9c683b81ca29f 100644
--- a/components/password_manager/core/browser/password_form_manager.cc
+++ b/components/password_manager/core/browser/password_form_manager.cc
@@ -1148,6 +1148,8 @@ 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 &&