Make unit_tests compile in Mac GN

chrome/app_shim/app_shim.gypi

 # Copyright 2014 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': [
     {
       # This is the part of the shim process compiled into Chrome. It runs only
       # in the shim process, after the shim finds and loads the Chrome
       # Framework bundle.
+      #
+      # GN version: //chrome/app_shim
       'target_name': 'app_shim',
       'type': 'static_library',
       'dependencies': [
         # Since app_shim and browser depend on each other, we omit the
         # dependency on browser here.
         '../chrome/chrome_resources.gyp:chrome_strings',
         'app_mode_app_support',
       ],
       'sources': [
         'chrome_main_app_mode_mac.mm',
@@ skipping 52 matching lines @@
           'postbuild_name': 'Tweak Info.plist',
           'action': ['<(tweak_info_plist_path)',
                      '--breakpad=0',
                      '--keystone=0',
                      '--scm=0'],
         },
       ],
     },  # target app_mode_app
   ],  # targets
 }