Converts ios/chrome/browser/native_app_launcher:native_app_launcher_internal to ARC.

ios/chrome/browser/native_app_launcher/BUILD.gn

 # Copyright 2016 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.
 
 source_set("native_app_launcher") {
   sources = [
     "ios_appstore_ids.h",
     "ios_appstore_ids.mm",
     "native_app_infobar_controller.h",
     "native_app_infobar_controller.mm",
@@ skipping 33 matching lines @@
     "//ios/web",
     "//ios/web:test_support",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//url",
   ]
 }
 
 source_set("native_app_launcher_internal") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "native_app_navigation_controller.h",
     "native_app_navigation_controller.mm",
     "native_app_navigation_util.h",
     "native_app_navigation_util.mm",
   ]
   deps = [
     ":native_app_launcher",
     "//base",
     "//components/infobars/core",
@@ skipping 34 matching lines @@
     "//ios/public/provider/chrome/browser/signin:test_support",
     "//ios/web",
     "//ios/web:test_support",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }