Ensure the xpc transaction is ended

chrome/browser/ui/cocoa/notifications/BUILD.gn

 # Copyright 2016 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/util/branding.gni")
 import("//build/config/mac/rules.gni")
 
 mac_app_bundle("alert_notification_xpc_service") {
   output_name = "AlertNotificationService"
   package_type = "xpc"
 
   info_plist = "xpc-Info.plist"
   extra_substitutions = [ "CHROME_BUNDLE_ID=$chrome_mac_bundle_id" ]
 
   sources = [
     "alert_notification_service.h",
     "alert_notification_service.mm",
     "notification_service_delegate.h",
     "notification_service_delegate.mm",
     "xpc_service_main.mm",
+    "xpc_transaction_handler.h",
+    "xpc_transaction_handler.mm",
   ]
 
   deps = [
     ":common",
     "//base:base",
   ]
 
   libs = [
     "AppKit.framework",
     "Foundation.framework",
@@ skipping 19 matching lines @@
     "notification_constants_mac.mm",
     "notification_delivery.h",
     "notification_response_builder_mac.h",
     "notification_response_builder_mac.mm",
   ]
 
   deps = [
     "//base:base",
   ]
 }