Extract the SafeSearch client to a separate directory

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index c27862b22620e6222f40d14b0c6c285e94cb95cb..b4f3f579879be8fe5d3f29dfe4c7235aa851378b 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -991,6 +991,8 @@ split_static_library("browser") {
     "safe_browsing/srt_field_trial_win.h",
     "safe_browsing/srt_global_error_win.cc",
     "safe_browsing/srt_global_error_win.h",
+    "safe_search_api/safe_search_url_checker.cc",
+    "safe_search_api/safe_search_url_checker.h",
     "search/iframe_source.cc",
     "search/iframe_source.h",
     "search/instant_io_context.cc",
@@ -3500,8 +3502,6 @@ split_static_library("browser") {
       "supervised_user/child_accounts/permission_request_creator_apiary.h",
       "supervised_user/experimental/safe_search_url_reporter.cc",
       "supervised_user/experimental/safe_search_url_reporter.h",
-      "supervised_user/experimental/supervised_user_async_url_checker.cc",
-      "supervised_user/experimental/supervised_user_async_url_checker.h",
       "supervised_user/experimental/supervised_user_blacklist.cc",
       "supervised_user/experimental/supervised_user_blacklist.h",
       "supervised_user/experimental/supervised_user_filtering_switches.cc",