[ObjC ARC] Converts ios/testing:ios_test_support to ARC.Automatically generated ARCMigrate commit…

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")
 
 source_set("ios_test_support") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
 
   deps = [
     "//base/test:test_support",
   ]
 
   sources = [
     "wait_util.h",
     "wait_util.mm",
   ]
@@ skipping 26 matching lines @@
     "//testing/gtest",
     "//third_party/ocmock",
   ]
 
   sources = [
     "ocmock_complex_type_helper_unittest.mm",
   ]
 
   assert_no_deps = ios_assert_no_deps
 }