Mac: Give app_shim code a nicer home

chrome/chrome_common.gypi

 # Copyright (c) 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.
 
 {
   'variables': {
     # File lists shared with GN build.
     'chrome_common_sources': [
-      '../apps/app_shim/app_shim_launch.h',
-      '../apps/app_shim/app_shim_messages.h',
       'common/all_messages.h',
       'common/attrition_experiments.h',
       'common/auto_start_linux.cc',
       'common/auto_start_linux.h',
       'common/badge_util.cc',
       'common/badge_util.h',
       'common/child_process_logging.h',
       'common/child_process_logging_win.cc',
       'common/chrome_content_client.cc',
       'common/chrome_content_client.h',
@@ skipping 100 matching lines @@
       'common/ini_parser.h',
       'common/instant_restricted_id_cache.h',
       'common/instant_types.cc',
       'common/instant_types.h',
       'common/localized_error.cc',
       'common/localized_error.h',
       'common/logging_chrome.cc',
       'common/logging_chrome.h',
       'common/mac/app_mode_common.h',
       'common/mac/app_mode_common.mm',
+      'common/mac/app_shim_launch.h',
+      'common/mac/app_shim_messages.h',
       'common/mac/cfbundle_blocker.h',
       'common/mac/cfbundle_blocker.mm',
       'common/mac/launchd.h',
       'common/mac/launchd.mm',
       'common/mac/objc_zombie.h',
       'common/mac/objc_zombie.mm',
       'common/media/webrtc_logging_messages.h',
       'common/media/webrtc_logging_message_data.cc',
       'common/media/webrtc_logging_message_data.h',
       'common/media_galleries/metadata_types.h',
@@ skipping 546 matching lines @@
         'common/safe_browsing/csd.proto'
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',
         'proto_out_dir': 'chrome/common/safe_browsing',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }