Build aura_shell_unittests on Mac try bot target

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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 593 matching lines @@
                 '../chrome/chrome.gyp:sync_unit_tests',
                 '../content/content.gyp:content_unittests',
                 '../ipc/ipc.gyp:ipc_tests',
                 '../sql/sql.gyp:sql_unittests',
                 '../ui/ui.gyp:gfx_unittests',
               ],
             }],
             ['OS=="mac"', {
               # Exclude dependencies that are not currently implemented.
               'dependencies!': [
-                '../ash/ash.gyp:aura_shell_unittests',
                 '../chrome/chrome.gyp:chrome',
                 '../chrome/chrome.gyp:unit_tests',
                 '../chrome/chrome.gyp:ui_tests',
                 '../ui/views/views.gyp:views_unittests',
               ],
             }],
           ],
         },
       ],  # targets
     }], # "use_aura==1"
   ], # conditions
 }