Remove --show-app-list-shortcut flag and implement new app launcher enable logic.

apps/apps.gypi

 # Copyright 2013 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': 'apps',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 26 matching lines @@
         'field_trial_names.cc',
         'field_trial_names.h',
         'pref_names.cc',
         'pref_names.h',
         'prefs.cc',
         'prefs.h',
         'shortcut_manager.cc',
         'shortcut_manager.h',
         'shortcut_manager_factory.cc',
         'shortcut_manager_factory.h',
-        'switches.cc',
-        'switches.h',
       ],
       'conditions': [
         ['enable_extensions==0',
           {
             'sources/': [
               ['exclude', '^apps/'],
             ],
           }
         ],
       ],
@@ skipping 36 matching lines @@
               'VCLinkerTool': {
                 'SubSystem': '2',  # Set /SUBSYSTEM:WINDOWS
               },
             },
           },
         ],
       },
     ],  # 'OS=="win"'
   ],  # 'conditions'
 }