Implement Windows GPO support for "dlpref" in component updater.

components/update_client/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.
 
 source_set("update_client") {
   sources = [
     "action.cc",
     "action.h",
     "action_update.cc",
     "action_update.h",
@@ skipping 78 matching lines @@
   testonly = true
   sources = [
     "component_patcher_unittest.cc",
     "crx_downloader_unittest.cc",
     "ping_manager_unittest.cc",
     "request_sender_unittest.cc",
     "update_checker_unittest.cc",
     "update_client_unittest.cc",
     "update_query_params_unittest.cc",
     "update_response_unittest.cc",
+    "utils_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     ":update_client",
     "//base",
     "//courgette:courgette_lib",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libxml",
   ]
 }