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 ee3c22722d35e7546858bb24918628655050afd8..b982b76a0416db3a775400e4a5f33fc853bb51ee 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1452,7 +1452,6 @@ 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",
@@ -4010,7 +4009,6 @@ 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_browsing/settings_reset_prompt/settings_reset_prompt_config_unittest.cc",
       "../browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_model_unittest.cc",