Re-enable about:flags on Android

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 2068 matching lines @@
             'browser/bookmarks/bookmark_html_writer_unittest.cc',
 
             'browser/shell_integration_unittest.cc',
 
             # No service process (which also requires multiprocess lock).
             'common/multi_process_lock_unittest.cc',
 
             # Sync setup uses native ui.
             'browser/ui/webui/sync_setup_handler_unittest.cc',
 
-            # about:flags is unsupported.
-            'browser/about_flags_unittest.cc',
-
             # There's no Browser/BrowserList on Android.
             'browser/browser_commands_unittest.cc',
             'browser/managed_mode/managed_mode_unittest.cc',
             'browser/managed_mode/managed_mode_url_filter_unittest.cc',
             'browser/net/gaia/gaia_oauth_fetcher_unittest.cc',
             'browser/page_cycler/page_cycler_unittest.cc',
             'browser/profiles/off_the_record_profile_impl_unittest.cc',
             'browser/sync/profile_sync_service_session_unittest.cc',
             'browser/sync/sync_global_error_unittest.cc',
             'browser/tab_contents/render_view_context_menu_unittest.cc',
@@ skipping 204 matching lines @@
             'unit_tests.isolate',
           ],
           'sources': [
             'unit_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }