Remove default whitelist for grit on iOS.

components/components_strings.gyp

 # 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': [
     {
       'target_name': 'components_strings',
       'type': 'none',
       'variables': {
         'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/components/strings',
       },
       'actions': [
         {
           # GN version: //components/strings:components_strings
           'action_name': 'generate_components_strings',
           'variables': {
-            'grit_whitelist': '',
             'grit_grd_file': 'components_strings.grd',
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
         {
           # GN version: //components/strings:components_chromium_strings
           'action_name': 'generate_components_chromium_strings',
           'variables': {
-            'grit_whitelist': '',
             'grit_grd_file': 'components_chromium_strings.grd',
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
         {
           # GN version: //components/strings:components_google_chrome_strings
           'action_name': 'generate_components_google_chrome_strings',
           'variables': {
-            'grit_whitelist': '',
             'grit_grd_file': 'components_google_chrome_strings.grd',
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
       ],
       'includes': [ '../build/grit_target.gypi' ],
     },
   ],
 }