Test current behavior of -component-updater=fast-update in ConfiguratorImpl.

components/component_updater/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("component_updater") {
   sources = [
     "component_updater_paths.cc",
     "component_updater_paths.h",
     "component_updater_service.cc",
     "component_updater_service.h",
@@ skipping 32 matching lines @@
     ":component_updater",
     "//base",
     "//testing/gmock",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "component_updater_service_unittest.cc",
+    "configurator_impl_unittest.cc",
     "default_component_installer_unittest.cc",
     "timer_unittest.cc",
   ]
 
   deps = [
     ":component_updater",
     "//base",
     "//base/test:test_support",
     "//components/update_client:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }