Remove default whitelist for grit on iOS.

ios/chrome/ios_today_extension_resources.gyp

 # Copyright 2015 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': {
     'chromium_code': 1,
     'grit_base_dir': '<(SHARED_INTERMEDIATE_DIR)',
     'grit_out_dir': '<(grit_base_dir)/ios/today_extension',
   },
   'targets': [
     {
       'target_name': 'ios_today_extension_resources',
       'type': 'none',
       'dependencies': [
         'ios_today_extension_strings_gen',
       ],
     },
     {
       'target_name': 'ios_today_extension_strings_gen',
       'type': 'none',
       'hard_dependency': 1,
       'actions': [
         {
           'action_name': 'generate_ios_today_extension_strings',
           'variables': {
-            'grit_whitelist': '',
             'grit_grd_file': 'today_extension/strings/ios_today_extension_strings.grd',
           },
           'includes': [ '../../build/grit_action.gypi' ],
         },
       ],
       'includes': [ '../../build/grit_target.gypi' ],
       # Override the exported include-dirs; ios/chrome/grit/ios_*strings.h
       # should only be referenceable as ios/chrome/grit to allow DEPS-time
       # checking of usage.
       'direct_dependent_settings': {
@@ skipping 38 matching lines @@
             '-s', '<(SHARED_INTERMEDIATE_DIR)',
             '-b', '<(branding_path_component)',
             '<@(locales)',
           ],
         },
       ],
     },
   ],
 }