Move apps/shell to extensions/shell.

build/all.gyp

 # Copyright (c) 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': {
     # A hook that can be overridden in other repositories to add additional
     # compilation targets to 'All'. Only used on Android.
     'android_app_targets%': [],
   },
@@ skipping 217 matching lines @@
             '../ui/app_list/app_list.gyp:*',
           ],
         }],
         ['OS!="android" and OS!="ios"', {
           'dependencies': [
             '../google_apis/gcm/gcm.gyp:*',
           ],
         }],
         ['chromeos==1 or (OS=="linux" and use_aura==1)', {
           'dependencies': [
-            '../apps/shell/app_shell.gyp:*',
+            '../extensions/shell/app_shell.gyp:*',
           ],
         }],
         ['chromeos==1', {
           'dependencies': [
             '../athena/main/athena_main.gyp:*',
           ],
         }],
       ],
     }, # target_name: All
     {
@@ skipping 1030 matching lines @@
           'dependencies': [
             '../ui/views/examples/examples.gyp:views_examples_with_content_exe',
             '../ui/views/views.gyp:views',
             '../ui/views/views.gyp:views_unittests',
           ],
         },  # target_name: macviews_builder
       ],  # targets
     }],  # os=='mac' and toolkit_views==1
   ],  # conditions
 }