Remove unused AppKeepAliveService

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, },
       # Since browser and browser_extensions actually depend on each other,
       # we must omit the dependency from browser_extensions to browser.
       # However, this means browser_extensions and browser should more or less
       # have the same dependencies. Once browser_extensions is untangled from
       # browser, then we can clean up these dependencies.
       'dependencies': [
         'browser_extensions',
         'common/extensions/api/api.gyp:api',
         '../skia/skia.gyp:skia',
       ],
       'include_dirs': [
         '<(INTERMEDIATE_DIR)',
         '<(grit_out_dir)',
       ],
       'sources': [
-        'app_keep_alive_service.cc',
-        'app_keep_alive_service.h',
-        'app_keep_alive_service_factory.cc',
-        'app_keep_alive_service_factory.h',
         'app_lifetime_monitor.cc',
         'app_lifetime_monitor.h',
         'app_lifetime_monitor_factory.cc',
         'app_lifetime_monitor_factory.h',
         'app_load_service.cc',
         'app_load_service.h',
         'app_load_service_factory.cc',
         'app_load_service_factory.h',
         'app_restore_service.cc',
         'app_restore_service.h',
@@ skipping 157 matching lines @@
               'dependencies': [
                 '../sandbox/sandbox.gyp:sandbox',
               ],
             }],
           ],
         },
       ],  # targets
     }],  # chromeos==1
   ],  # conditions
 }