Make full-form autofill the only implementation on iOS.

components/autofill.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.
 
 {
   'targets': [
     {
       # GN version: //components/autofill/core/common
       'target_name': 'autofill_core_common',
       'type': 'static_library',
@@ skipping 232 matching lines @@
 
       # This is needed because GYP's handling of transitive dependencies is
       # not great. See https://goo.gl/QGtlae for details.
       'export_dependent_settings': [
         'autofill_server_proto',
       ],
 
       'conditions': [
         ['OS=="ios"', {
           'sources': [
-            'autofill/core/browser/autofill_field_trial_ios.cc',
-            'autofill/core/browser/autofill_field_trial_ios.h',
             'autofill/core/browser/keyboard_accessory_metrics_logger.h',
             'autofill/core/browser/keyboard_accessory_metrics_logger.mm',
           ],
         }],
         ['OS=="ios" or OS=="android"', {
           'sources': [
             'autofill/core/browser/autofill_save_card_infobar_delegate_mobile.cc',
             'autofill/core/browser/autofill_save_card_infobar_delegate_mobile.h',
             'autofill/core/browser/autofill_save_card_infobar_mobile.h',
           ],
@@ skipping 373 matching lines @@
             ],
           },
           'includes': [
             '../ios/web/js_compile_checked.gypi',
           ],
         },
       ],
     }],
   ],
 }