[ObjC ARC] Converts ios/chrome/browser:about_flags to ARC.Automatically generated ARCMigrate comm…

ios/chrome/browser/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 declare_args() {
   google_test_gaia_client_id = ""
   google_test_gaia_client_secret = ""
@@ skipping 160 matching lines @@
 
   if (enable_rlz) {
     deps += [ "//ios/chrome/browser/rlz" ]
   }
 }
 
 # This is a separate target so that the 'defines' does not leak to the
 # other files (which would increase the compilation time when changing
 # the value).
 source_set("about_flags") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "about_flags.h",
     "about_flags.mm",
   ]
 
   deps = [
     ":browser",
     "//base",
     "//components/autofill/core/common",
     "//components/dom_distiller/core",
@@ skipping 40 matching lines @@
     "//components/proxy_config",
     "//components/ssl_config",
     "//components/variations",
     "//ios/web:test_support",
     "//net",
     "//net:test_support",
     "//testing/gtest",
     "//url",
   ]
 }