Allow overriding WebUIFactory when test flag is set.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 2418 matching lines @@
         'browser/ui/login/login_prompt_browsertest.cc',
         'browser/ui/panels/panel_browsertest.cc',
         'browser/ui/panels/panel_browser_view_browsertest.cc',
         'browser/ui/views/browser_actions_container_browsertest.cc',
         'browser/ui/views/dom_view_browsertest.cc',
         'browser/ui/views/html_dialog_view_browsertest.cc',
         'browser/ui/webui/chrome_url_data_manager_browsertest.cc',
         'browser/ui/webui/mediaplayer_browsertest.cc',
         'browser/ui/webui/ntp/most_visited_browsertest.cc',
         'browser/ui/webui/settings_browsertest.cc',
+        'browser/ui/webui/test_chrome_web_ui_factory_browsertest.cc',
         'browser/ui/webui/BidiCheckerWebUITest.cc',
         'browser/ui/webui/BidiCheckerWebUITest.h',
         'browser/ui/webui/web_ui_browsertest.cc',
         'browser/ui/webui/web_ui_browsertest.h',
         'browser/ui/webui/web_ui_test_handler.cc',
         'browser/ui/webui/web_ui_test_handler.h',
         'renderer/autofill/autofill_browsertest.cc',
         'renderer/autofill/form_autocomplete_browsertest.cc',
         'renderer/autofill/form_manager_browsertest.cc',
         'renderer/autofill/password_autofill_manager_unittest.cc',
@@ skipping 1547 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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