Extract the SafeSearch client to a separate directory

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index b5a05cfca028c69c1a7aaa0d780de1fa981e1d5e..5b3235cfc305c21b8fb3fbcb199e87fff5e44cdc 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -3859,6 +3859,7 @@ test("unit_tests") {
       "../browser/notifications/extension_welcome_notification_unittest.cc",
       "../browser/notifications/notification_conversion_helper_unittest.cc",
       "../browser/renderer_context_menu/context_menu_content_type_unittest.cc",
+      "../browser/safe_search_api/safe_search_url_checker_unittest.cc",
       "../browser/search/hotword_service_unittest.cc",
       "../browser/signin/easy_unlock_app_manager_unittest.cc",
       "../browser/signin/easy_unlock_auth_attempt_unittest.cc",
@@ -4739,7 +4740,6 @@ test("unit_tests") {
       "../browser/supervised_user/child_accounts/family_info_fetcher_unittest.cc",
       "../browser/supervised_user/child_accounts/permission_request_creator_apiary_unittest.cc",
       "../browser/supervised_user/experimental/safe_search_url_reporter_unittest.cc",
-      "../browser/supervised_user/experimental/supervised_user_async_url_checker_unittest.cc",
       "../browser/supervised_user/supervised_user_bookmarks_handler_unittest.cc",
       "../browser/supervised_user/supervised_user_pref_store_unittest.cc",
       "../browser/supervised_user/supervised_user_service_unittest.cc",