Move apps/app_shim to chrome/browser/apps

chrome/browser/apps/app_shim/app_shim.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': 'app_shim',
       'type': 'static_library',
       # Since app_shim and browser depend on each other, we omit the dependency
@@ skipping 16 matching lines @@
         'app_shim_host_manager_mac.mm',
         'chrome_main_app_mode_mac.mm',
         'extension_app_shim_handler_mac.cc',
         'extension_app_shim_handler_mac.h',
         'unix_domain_socket_acceptor.cc',
         'unix_domain_socket_acceptor.h',
       ],
     },
   ],  # targets
 }