[Downloads] Prevent dangerous files from being opened automatically.

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
       '../components/autofill/content/renderer/test_password_generation_agent.h',
@@ skipping 67 matching lines @@
       'browser/content_settings/permission_queue_controller_unittest.cc',
       'browser/content_settings/tab_specific_content_settings_unittest.cc',
       'browser/custom_handlers/protocol_handler_registry_unittest.cc',
       'browser/devtools/device/webrtc/devtools_bridge_instances_request_unittest.cc',
       'browser/devtools/devtools_network_controller_unittest.cc',
       'browser/download/all_download_item_notifier_unittest.cc',
       'browser/download/chrome_download_manager_delegate_unittest.cc',
       'browser/download/download_history_unittest.cc',
       'browser/download/download_item_model_unittest.cc',
       'browser/download/download_path_reservation_tracker_unittest.cc',
+      'browser/download/download_prefs_unittest.cc',
       'browser/download/download_query_unittest.cc',
       'browser/download/download_request_infobar_delegate_unittest.cc',
       'browser/download/download_request_limiter_unittest.cc',
       'browser/download/download_status_updater_unittest.cc',
       'browser/download/download_target_determiner_unittest.cc',
       'browser/download/download_ui_controller_unittest.cc',
       'browser/enumerate_modules_model_unittest_win.cc',
       'browser/external_protocol/external_protocol_handler_unittest.cc',
       'browser/favicon/chrome_fallback_icon_client_unittest.cc',
       'browser/file_select_helper_unittest.cc',
@@ skipping 2748 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }