Enable devices page UI on MacOSX

chrome/chrome_tests.gypi

 # Copyright 2013 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 2016 matching lines @@
             ['exclude', '^browser/printing/cloud_print/test/.*'],
             ['exclude', '^browser/printing/printing_layout_browsertest.cc'],
             ['exclude', '^browser/printing/print_preview_dialog_controller_browsertest.cc'],
             ['exclude', '^browser/ui/webui/print_preview/print_preview_ui_browsertest.cc'],
             ['exclude', '^renderer/printing/print_web_view_helper_browsertest.cc'],
             ['exclude', '^test/data/webui/print_preview.cc'],
             ['exclude', '^test/data/webui/print_preview.h'],
             ['exclude', '^test/data/webui/print_preview.js'],
           ],
         }],
-        ['enable_mdns==1', {
+        ['enable_service_discovery==1', {
           'sources' : [
             'browser/ui/webui/local_discovery/local_discovery_ui_browsertest.cc',
           ]
         }],
         [ 'use_brlapi==0', {
           'sources!': [
             'browser/extensions/api/braille_display_private/braille_display_private_apitest.cc'
             ]
         }],
         ['branding=="Chrome"', {
@@ skipping 1172 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }