[ObjC ARC] Converts ios/testing:ocmock_support_unittest to ARC.

ios/testing/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("//ios/build/config.gni")
 import("//testing/test.gni")
 
 group("all_tests") {
   testonly = true
   deps = [
@@ skipping 28 matching lines @@
     "//third_party/ocmock",
   ]
 
   sources = [
     "ocmock_complex_type_helper.h",
     "ocmock_complex_type_helper.mm",
   ]
 }
 
 test("ocmock_support_unittest") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   deps = [
     ":ocmock_support",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/ocmock",
   ]
 
   sources = [
@@ skipping 31 matching lines @@
     "data/http_server_files/window_location.html",
     "data/http_server_files/window_location.js",
     "data/http_server_files/window_open.html",
     "data/http_server_files/window_proxy.html",
   ]
   outputs = [
     "{{bundle_resources_dir}}/" +
         "{{source_root_relative_dir}}/{{source_file_part}}",
   ]
 }