Improve support for multiselect list box accessibility on Windows.

base/base.gyp

 # Copyright (c) 2011 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': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 217 matching lines @@
         'time_win_unittest.cc',
         'timer_unittest.cc',
         'tools_sanity_unittest.cc',
         'tracked_objects_unittest.cc',
         'tuple_unittest.cc',
         'utf_offset_string_conversions_unittest.cc',
         'utf_string_conversions_unittest.cc',
         'values_unittest.cc',
         'version_unittest.cc',
         'vlog_unittest.cc',
+        'win/enum_variant_unittest.cc',
         'win/event_trace_consumer_unittest.cc',
         'win/event_trace_controller_unittest.cc',
         'win/event_trace_provider_unittest.cc',
         'win/i18n_unittest.cc',
+        'win/iunknown_impl_unittest.cc',
         'win/object_watcher_unittest.cc',
         'win/pe_image_unittest.cc',
         'win/registry_unittest.cc',
         'win/scoped_bstr_unittest.cc',
         'win/scoped_comptr_unittest.cc',
         'win/scoped_variant_unittest.cc',
         'win/win_util_unittest.cc',
         'win/wrapped_window_proc_unittest.cc',
       ],
       'dependencies': [
@@ skipping 194 matching lines @@
           'msvs_settings': {
             'VCLinkerTool': {
               'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
             },
           },
         },
       ],
     }],
   ],
 }