Allow overriding WebUIFactory when test flag is set.

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 3429 matching lines @@
         'browser/ui/webui/print_preview_ui_html_source.cc',
         'browser/ui/webui/print_preview_ui_html_source.h',
         'browser/ui/webui/screenshot_source.cc',
         'browser/ui/webui/screenshot_source.h',
         'browser/ui/webui/shared_resources_data_source.cc',
         'browser/ui/webui/shared_resources_data_source.h',
         'browser/ui/webui/sync_internals_html_source.cc',
         'browser/ui/webui/sync_internals_html_source.h',
         'browser/ui/webui/sync_internals_ui.cc',
         'browser/ui/webui/sync_internals_ui.h',
+        'browser/ui/webui/test_chrome_web_ui_factory.cc',
+        'browser/ui/webui/test_chrome_web_ui_factory.h',
         'browser/ui/webui/textfields_ui.cc',
         'browser/ui/webui/textfields_ui.h',
         'browser/ui/webui/theme_source.cc',
         'browser/ui/webui/theme_source.h',
         'browser/ui/webui/web_ui_util.cc',
         'browser/ui/webui/web_ui_util.h',
         'browser/ui/window_sizer.cc',
         'browser/ui/window_sizer.h',
         'browser/ui/window_sizer_linux.cc',
         'browser/ui/window_sizer_mac.mm',
@@ skipping 1147 matching lines @@
       'hard_dependency': 1,
     },
   ],
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: