[ObjC ARC] Converts ios/chrome/browser/geolocation:unit_tests to ARC.Automatically generated ARCM…

ios/chrome/browser/geolocation/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("geolocation") {
   sources = [
     "CLLocation+OmniboxGeolocation.h",
     "CLLocation+OmniboxGeolocation.mm",
     "CLLocation+XGeoHeader.h",
     "CLLocation+XGeoHeader.mm",
@@ skipping 27 matching lines @@
     "test_location_manager.h",
     "test_location_manager.mm",
   ]
   deps = [
     ":geolocation",
     "//base",
   ]
 }
 
 source_set("unit_tests") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "CLLocation+XGeoHeaderTest.mm",
     "location_manager_unittest.mm",
     "omnibox_geolocation_local_state_unittest.mm",
   ]
   deps = [
     ":geolocation",
     "//base",
     "//components/prefs:test_support",
     "//ios/chrome/test:test_support",
     "//ios/public/provider/chrome/browser",
     "//testing/gtest",
     "//third_party/ocmock",
   ]
 }