[ObjC ARC] Converts ios/chrome/test/earl_grey:ios_chrome_device_check_egtests to ARC.

ios/chrome/test/earl_grey/chrome_ios_eg_test.gni

 # 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.
 
 import("//build/mac/tweak_info_plist.gni")
 import("//build/config/ios/ios_sdk.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 import("//ios/third_party/earl_grey/ios_eg_test.gni")
 
@@ skipping 132 matching lines @@
     if (ios_automatically_manage_certs) {
       # Use the same bundle identifier for EarlGrey tests as for unit tests
       # when managing certificates as the number of free certs is limited.
       extra_substitutions +=
           [ "CHROMIUM_BUNDLE_ID=gtest.${ios_generic_test_bundle_id_suffix}" ]
     } else {
       extra_substitutions += [ "CHROMIUM_BUNDLE_ID=gtest.$target_name" ]
     }
   }
 }
+
+set_defaults("chrome_ios_eg_test") {
+  configs = default_executable_configs
+}