Make Hands-Off Zero-Touch Enrollment compatibile with tests

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 2176 matching lines @@
         "../browser/chromeos/login/mixin_based_browser_test.cc",
         "../browser/chromeos/login/mixin_based_browser_test.h",
         "../browser/chromeos/login/oobe_localization_browsertest.cc",
         "../browser/chromeos/login/proxy_auth_dialog_browsertest.cc",
         "../browser/chromeos/login/reset_browsertest.cc",
         "../browser/chromeos/login/resource_loader_browsertest.cc",
         "../browser/chromeos/login/saml/saml_browsertest.cc",
         "../browser/chromeos/login/screens/hid_detection_screen_browsertest.cc",
         "../browser/chromeos/login/screens/mock_enable_debugging_screen.cc",
         "../browser/chromeos/login/screens/mock_enable_debugging_screen.h",
-        "../browser/chromeos/login/screens/mock_error_screen.cc",
-        "../browser/chromeos/login/screens/mock_error_screen.h",
         "../browser/chromeos/login/screens/mock_eula_screen.cc",
         "../browser/chromeos/login/screens/mock_eula_screen.h",
-        "../browser/chromeos/login/screens/mock_network_screen.cc",
-        "../browser/chromeos/login/screens/mock_network_screen.h",
-        "../browser/chromeos/login/screens/mock_update_screen.cc",
-        "../browser/chromeos/login/screens/mock_update_screen.h",
         "../browser/chromeos/login/screens/mock_wrong_hwid_screen.cc",
         "../browser/chromeos/login/screens/mock_wrong_hwid_screen.h",
         "../browser/chromeos/login/screens/network_screen_browsertest.cc",
         "../browser/chromeos/login/screens/update_screen_browsertest.cc",
         "../browser/chromeos/login/screens/user_selection_screen_browsertest.cc",
         "../browser/chromeos/login/session/chrome_session_manager_browsertest.cc",
         "../browser/chromeos/login/session_login_browsertest.cc",
         "../browser/chromeos/login/signin/device_id_browsertest.cc",
         "../browser/chromeos/login/signin/oauth2_browsertest.cc",
         "../browser/chromeos/login/supervised/supervised_user_creation_browsertest.cc",
@@ skipping 2915 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }