Move apps/shell to extensions/shell.

athena/main/athena_main.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'athena_main',
       'type': 'executable',
       'dependencies': [
         '../athena.gyp:athena_lib',
         '../athena.gyp:athena_content_lib',
         '../resources/athena_resources.gyp:athena_pak',
-        '../../apps/shell/app_shell.gyp:app_shell_lib',
         # debug_widow.cc depends on this. Remove this once debug_window
         # is removed.
         '../../ash/ash_resources.gyp:ash_resources',
         '../../chromeos/chromeos.gyp:power_manager_proto',
         '../../components/components.gyp:autocomplete',
         '../../components/components.gyp:component_metrics_proto',
         '../../components/components.gyp:history_core_browser',
         # infobars_test_support is required to declare some symbols used in the
         # search_engines and its dependencies. See crbug.com/386171
         # TODO(mukai): declare those symbols for Athena.
         '../../components/components.gyp:infobars_test_support',
         '../../components/components.gyp:search_engines',
+        '../../extensions/shell/app_shell.gyp:app_shell_lib',
         '../../skia/skia.gyp:skia',
         '../../ui/accessibility/accessibility.gyp:ax_gen',
         '../../ui/app_list/app_list.gyp:app_list',
         '../../ui/keyboard/keyboard.gyp:keyboard',
         '../../ui/views/views.gyp:views',
         '../../url/url.gyp:url_lib',
       ],
       'include_dirs': [
         '../..',
       ],
@@ skipping 25 matching lines @@
         '../../ui/resources/ui_resources.gyp:ui_test_pak',
         '../athena.gyp:athena_lib',
         '../athena.gyp:athena_test_support',
       ],
       'sources': [
         'athena_shell.cc',
       ],
     }
   ],  # targets
 }