Make full-form autofill the only implementation on iOS.

components/autofill/core/browser/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 
 # GYP version: components/autofill.gyp:autofill_core_browser
 source_set("browser") {
   sources = [
     "address.cc",
@@ skipping 129 matching lines @@
     "webdata/autofill_webdata_backend.h",
     "webdata/autofill_webdata_backend_impl.cc",
     "webdata/autofill_webdata_backend_impl.h",
     "webdata/autofill_webdata_service.cc",
     "webdata/autofill_webdata_service.h",
     "webdata/autofill_webdata_service_observer.h",
   ]
 
   if (is_ios) {
     sources += [
-      "autofill_field_trial_ios.cc",
-      "autofill_field_trial_ios.h",
       "keyboard_accessory_metrics_logger.h",
       "keyboard_accessory_metrics_logger.mm",
     ]
   }
 
   if (is_ios || is_android) {
     sources += [
       "autofill_save_card_infobar_delegate_mobile.cc",
       "autofill_save_card_infobar_delegate_mobile.h",
       "autofill_save_card_infobar_mobile.h",
@@ skipping 189 matching lines @@
     "//sync",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libaddressinput:util",
     "//third_party/libphonenumber",
     "//ui/base",
     "//url",
   ]
 }