MD Settings: Add "Auto Open" setting to Downloads C++ handler.

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 3708 matching lines @@
       "../browser/ui/webui/help/version_updater_chromeos_unittest.cc",
       "../browser/ui/webui/md_downloads/downloads_list_tracker_unittest.cc",
       "../browser/ui/webui/md_downloads/md_downloads_dom_handler_unittest.cc",
       "../browser/ui/webui/ntp/ntp_user_data_logger_unittest.cc",
       "../browser/ui/webui/options/autofill_options_handler_unittest.cc",
       "../browser/ui/webui/options/font_settings_utils_unittest.cc",
       "../browser/ui/webui/options/language_options_handler_unittest.cc",
       "../browser/ui/webui/options/password_manager_handler_unittest.cc",
       "../browser/ui/webui/options/pepper_flash_content_settings_utils_unittest.cc",
       "../browser/ui/webui/options/sync_setup_handler_unittest.cc",
+      "../browser/ui/webui/settings/downloads_handler_unittest.cc",
       "../browser/ui/webui/settings/metrics_reporting_handler_unittest.cc",
       "../browser/ui/webui/settings/people_handler_unittest.cc",
       "../browser/ui/webui/settings/profile_info_handler_unittest.cc",
       "../browser/ui/webui/settings/reset_settings_handler_unittest.cc",
       "../browser/ui/webui/settings/settings_manage_profile_handler_unittest.cc",
       "../browser/ui/webui/settings/site_settings_handler_unittest.cc",
       "../browser/ui/webui/settings_utils_unittest.cc",
       "../browser/ui/webui/signin/login_ui_service_unittest.cc",
       "../browser/ui/webui/site_settings_helper_unittest.cc",
       "../browser/ui/webui/sync_internals_message_handler_unittest.cc",
@@ skipping 1439 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }