Remove the notificationProvider extension API

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 7179c43e4e672e19d8caadd2d925f495facfc744..d8340726b9b55819da0a2638725c7cb55ef6fe1a 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1441,7 +1441,6 @@ test("browser_tests") {
       "../browser/extensions/api/module/module_apitest.cc",
       "../browser/extensions/api/music_manager_private/music_manager_private_browsertest.cc",
       "../browser/extensions/api/networking_config_chromeos_apitest_chromeos.cc",
-      "../browser/extensions/api/notification_provider/notification_provider_apitest.cc",
       "../browser/extensions/api/omnibox/omnibox_api_browsertest.cc",
       "../browser/extensions/api/page_capture/page_capture_apitest.cc",
       "../browser/extensions/api/passwords_private/passwords_private_apitest.cc",
@@ -3980,7 +3979,6 @@ test("unit_tests") {
       "../browser/media_galleries/chromeos/mtp_device_object_enumerator_unittest.cc",
       "../browser/metrics/extensions_metrics_provider_unittest.cc",
       "../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",