Reland http://codereview.chromium.org/4139008, with a different

chrome/chrome_browser.gypi

 # Copyright (c) 2010 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': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 1425 matching lines @@
         'browser/download/save_item.cc',
         'browser/download/save_item.h',
         'browser/download/save_package.cc',
         'browser/download/save_package.h',
         'browser/download/save_types.cc',
         'browser/download/save_types.h',
         'browser/encoding_menu_controller.cc',
         'browser/encoding_menu_controller.h',
         'browser/extensions/convert_user_script.cc',
         'browser/extensions/convert_user_script.h',
+        'browser/extensions/convert_web_app.cc',
+        'browser/extensions/convert_web_app.h',
         'browser/extensions/crashed_extension_infobar.cc',
         'browser/extensions/crashed_extension_infobar.h',
         'browser/extensions/crx_installer.cc',
         'browser/extensions/crx_installer.h',
         'browser/extensions/default_apps.cc',
         'browser/extensions/default_apps.h',
         'browser/extensions/extension_accessibility_api.cc',
         'browser/extensions/extension_accessibility_api.h',
         'browser/extensions/extension_accessibility_api_constants.cc',
         'browser/extensions/extension_accessibility_api_constants.h',
@@ skipping 2833 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: