Enable building with configuration_policy==1 on ios.

components/policy.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.
 
 {
   'includes': [
     # Included to get 'mac_bundle_id' and other variables.
     '../build/chrome_settings.gypi',
   ],
   'variables': {
@@ skipping 190 matching lines @@
             'policy/proto/device_management_local.proto',
           ],
           'variables': {
             'proto_in_dir': 'policy/proto',
             'proto_out_dir': 'policy/proto',
           },
           'includes': [
             '../build/protoc.gypi',
           ],
           'conditions': [
-            ['OS=="android"', {
+            ['OS=="android" or OS=="ios"', {
               'sources!': [
                 'policy/proto/chrome_extension_policy.proto',
               ],
             }],
             ['chromeos==0', {
               'sources!': [
                 'policy/proto/device_management_local.proto',
               ],
             }],
           ],
@@ skipping 197 matching lines @@
                   'Copy the Localizable.strings files to the manifest bundle',
               'process_outputs_as_mac_bundle_resources': 1,
               'msvs_cygwin_shell': 1,
             },
           ],
         },
       ],
     }],
   ],
 }