Add missing header files to GN files (2 of N)

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 1411 matching lines @@
       "../browser/extensions/api/file_system/file_system_apitest.cc",
       "../browser/extensions/api/file_system/file_system_apitest_chromeos.cc",
       "../browser/extensions/api/font_settings/font_settings_apitest.cc",
       "../browser/extensions/api/gcm/gcm_apitest.cc",
       "../browser/extensions/api/history/history_apitest.cc",
       "../browser/extensions/api/i18n/i18n_apitest.cc",
       "../browser/extensions/api/identity/identity_apitest.cc",
       "../browser/extensions/api/idltest/idltest_apitest.cc",
       "../browser/extensions/api/image_writer_private/image_writer_private_apitest.cc",
       "../browser/extensions/api/image_writer_private/test_utils.cc",
+      "../browser/extensions/api/image_writer_private/test_utils.h",
       "../browser/extensions/api/inline_install_private/inline_install_private_apitest.cc",
       "../browser/extensions/api/input_ime/input_ime_apitest_chromeos.cc",
       "../browser/extensions/api/instance_id/instance_id_apitest.cc",
       "../browser/extensions/api/log_private/log_private_apitest_chromeos.cc",
       "../browser/extensions/api/management/management_api_browsertest.cc",
       "../browser/extensions/api/management/management_apitest.cc",
       "../browser/extensions/api/management/management_browsertest.cc",
       "../browser/extensions/api/media_galleries/media_galleries_apitest.cc",
       "../browser/extensions/api/media_galleries/media_galleries_watch_apitest.cc",
       "../browser/extensions/api/messaging/native_messaging_apitest.cc",
@@ skipping 2466 matching lines @@
       "../browser/extensions/api/extension_action/extension_action_prefs_unittest.cc",
       "../browser/extensions/api/file_system/file_system_api_unittest.cc",
       "../browser/extensions/api/identity/extension_token_key_unittest.cc",
       "../browser/extensions/api/identity/gaia_web_auth_flow_unittest.cc",
       "../browser/extensions/api/identity/identity_mint_queue_unittest.cc",
       "../browser/extensions/api/image_writer_private/destroy_partitions_operation_unittest.cc",
       "../browser/extensions/api/image_writer_private/operation_manager_unittest.cc",
       "../browser/extensions/api/image_writer_private/operation_unittest.cc",
       "../browser/extensions/api/image_writer_private/removable_storage_provider_chromeos_unittest.cc",
       "../browser/extensions/api/image_writer_private/test_utils.cc",
+      "../browser/extensions/api/image_writer_private/test_utils.h",
       "../browser/extensions/api/image_writer_private/write_from_file_operation_unittest.cc",
       "../browser/extensions/api/image_writer_private/write_from_url_operation_unittest.cc",
       "../browser/extensions/api/management/management_api_unittest.cc",
       "../browser/extensions/api/omnibox/omnibox_unittest.cc",
       "../browser/extensions/api/passwords_private/passwords_private_delegate_impl_unittest.cc",
       "../browser/extensions/api/permissions/permissions_api_helpers_unittest.cc",
       "../browser/extensions/api/permissions/permissions_api_unittest.cc",
       "../browser/extensions/api/preference/preference_api_prefs_unittest.cc",
       "../browser/extensions/api/proxy/proxy_api_helpers_unittest.cc",
       "../browser/extensions/api/runtime/chrome_runtime_api_delegate_unittest.cc",
@@ skipping 1302 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }