Deprecate per notification type delegates.

content/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 1039 matching lines @@
     "notifications/notification_database.cc",
     "notifications/notification_database.h",
     "notifications/notification_database_data_conversions.cc",
     "notifications/notification_database_data_conversions.h",
     "notifications/notification_event_dispatcher_impl.cc",
     "notifications/notification_event_dispatcher_impl.h",
     "notifications/notification_id_generator.cc",
     "notifications/notification_id_generator.h",
     "notifications/notification_message_filter.cc",
     "notifications/notification_message_filter.h",
-    "notifications/page_notification_delegate.cc",
-    "notifications/page_notification_delegate.h",
     "notifications/platform_notification_context_impl.cc",
     "notifications/platform_notification_context_impl.h",
     "notifications/type_converters.cc",
     "notifications/type_converters.h",
     "payments/payment_app_context_impl.cc",
     "payments/payment_app_context_impl.h",
     "payments/payment_app_database.cc",
     "payments/payment_app_database.h",
     "payments/payment_app_provider_impl.cc",
     "payments/payment_app_provider_impl.h",
@@ skipping 1077 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }