CREDENTIAL: Serialize 'PasswordCredential' objects with "" as the federation.

chrome/browser/password_manager/native_backend_libsecret.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/password_manager/native_backend_libsecret.h"
 
 #include <dlfcn.h>
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 477 matching lines @@
       "ssl_valid", form.ssl_valid,
       "preferred", form.preferred,
       "date_created", base::Int64ToString(date_created).c_str(),
       "blacklisted_by_user", form.blacklisted_by_user,
       "type", form.type,
       "times_used", form.times_used,
       "scheme", form.scheme,
       "date_synced", base::Int64ToString(date_synced).c_str(),
       "display_name", UTF16ToUTF8(form.display_name).c_str(),
       "avatar_url", form.icon_url.spec().c_str(),
-      "federation_url", form.federation_origin.Serialize().c_str(),
+      // We serialize unique origins as "", in order to make other systems that
+      // read from the login database happy. https://crbug.com/591310
+      "federation_url", form.federation_origin.unique()
+          ? ""
+          : form.federation_origin.Serialize().c_str(),
       "should_skip_zero_click", form.skip_zero_click,
       "generation_upload_status", form.generation_upload_status,
       "form_data", form_data.c_str(),
       "application", app_string_.c_str(),
       nullptr);
   // clang-format on
 
   if (error) {
     LOG(ERROR) << "Libsecret add raw login failed: " << error->message;
     g_error_free(error);
@@ skipping 163 matching lines @@
     UMA_HISTOGRAM_ENUMERATION(
         "PasswordManager.PslDomainMatchTriggering",
         password_manager::ShouldPSLDomainMatchingApply(registered_domain)
             ? psl_domain_match_metric
             : password_manager::PSL_DOMAIN_MATCH_NOT_USED,
         password_manager::PSL_DOMAIN_MATCH_COUNT);
   }
   g_list_free(found);
   return forms;
 }