Deprecate per notification type delegates.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 3dc58f0323b47b9a225cee733aa061ffb55741dc..37f24322b7617807f3736c1db1ef73a99f3370bf 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -770,8 +770,6 @@ split_static_library("browser") {
     "notifications/notification_display_service_factory.cc",
     "notifications/notification_display_service_factory.h",
     "notifications/notification_handler.h",
-    "notifications/notification_object_proxy.cc",
-    "notifications/notification_object_proxy.h",
     "notifications/notification_permission_context.cc",
     "notifications/notification_permission_context.h",
     "notifications/notification_platform_bridge.h",
@@ -782,8 +780,6 @@ split_static_library("browser") {
     "notifications/notifier_state_tracker.h",
     "notifications/notifier_state_tracker_factory.cc",
     "notifications/notifier_state_tracker_factory.h",
-    "notifications/persistent_notification_delegate.cc",
-    "notifications/persistent_notification_delegate.h",
     "notifications/persistent_notification_handler.cc",
     "notifications/persistent_notification_handler.h",
     "notifications/platform_notification_service_impl.cc",