Allow embedder to use custom ResourceRequestAllowedNotifier

components/web_resource/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.
 
 static_library("web_resource") {
   sources = [
     "eula_accepted_notifier.cc",
     "eula_accepted_notifier.h",
     "resource_request_allowed_notifier.cc",
     "resource_request_allowed_notifier.h",
@@ skipping 25 matching lines @@
     ":web_resource",
     "//base",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "eula_accepted_notifier_unittest.cc",
     "resource_request_allowed_notifier_unittest.cc",
+    "web_resource_service_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     ":web_resource",
     "//base",
     "//components/prefs:test_support",
     "//components/version_info",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/icu",
   ]
 }