Use callbacks in SessionRestore unit tests

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//components/nacl/nacl_defines.gni")
 
 # //build/config/android/rules.gni imports //tools/grit/grit_rule.gni, which
@@ skipping 872 matching lines @@
     "password_manager/test_password_store_service.cc",
     "password_manager/test_password_store_service.h",
     "prefs/pref_service_mock_factory.cc",
     "prefs/pref_service_mock_factory.h",
     "profile_resetter/profile_resetter_test_base.cc",
     "profile_resetter/profile_resetter_test_base.h",
     "search_engines/template_url_service_factory_test_util.cc",
     "search_engines/template_url_service_factory_test_util.h",
     "search_engines/template_url_service_test_util.cc",
     "search_engines/template_url_service_test_util.h",
+    "sessions/session_restore_test_helper.cc",
+    "sessions/session_restore_test_helper.h",
     "sessions/session_service_test_helper.cc",
     "sessions/session_service_test_helper.h",
     "signin/fake_account_reconcilor.cc",
     "signin/fake_account_reconcilor.h",
     "signin/fake_account_tracker_service.cc",
     "signin/fake_account_tracker_service.h",
     "signin/fake_profile_oauth2_token_service.cc",
     "signin/fake_profile_oauth2_token_service.h",
     "signin/fake_profile_oauth2_token_service_builder.cc",
     "signin/fake_profile_oauth2_token_service_builder.h",
@@ skipping 167 matching lines @@
     ]
   }
 
   if (enable_wifi_bootstrapping) {
     sources += [
       "local_discovery/wifi/mock_wifi_manager.cc",
       "local_discovery/wifi/mock_wifi_manager.h",
     ]
   }
 }