mac => macos in the status file

tests/html/html.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 event_test: Skip  # Issue 1996
 webgl_1_test: Skip  # Issue 1495
 xmldocument_test: Skip  # XML in dart:html is incomplete
 xmlelement_test: Skip  # XML in dart:html is incomplete
 measurement_test: Pass, Fail  # Issue 1940
 
@@ skipping 12 matching lines @@
 documentfragment_test: Pass, Timeout
 
 [ $runtime == ie || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == opera ]
 # TODO(vsm): Triage DOM tests.
 dom_isolates_test: Fail
 htmloptionscollection_test: Fail # Issue 3813.
 shadow_dom_test: Skip # No ShadowDOM support except on tip dartium.
 shadow_dom_layout_test: Skip
 unknownelement_test: Fail # Issue 4189
 
-[ $runtime == ie || $runtime == safari || $runtime == ff || ($runtime == chrome && ($system == linux || $system == mac)) || $runtime == opera ]
+[ $runtime == ie || $runtime == safari || $runtime == ff || ($runtime == chrome && ($system == linux || $system == macos)) || $runtime == opera ]
 indexeddb_2_test: Fail  # Issue 1883 - IndexedDB methods don't handle maps correctly.
 
 [ $runtime == dartium || $runtime == chrome || $runtime == ie || $runtime == safari || $runtime == ff || $runtime == opera ]
 history_test: Fail
 
 [ $runtime == ie ]
 typed_arrays_1_test: Skip   # ie9 does not have typed arrays.
 typed_arrays_2_test: Skip
 typed_arrays_3_test: Skip
 typed_arrays_4_test: Skip
@@ skipping 164 matching lines @@
 svg_3_test: Skip # Timeout
 documentfragment_test: Skip # Timeout
 fileapi_test: Skip # Issue 3022
 
 [ $compiler == dart2js && $runtime == chrome && $system == windows]
 css_test: Pass, Fail # Issue #2823
 fileapi_test: Skip # Issue 3022
 
 [ $compiler == dart2js && $runtime == drt && $system == macos ]
 indexeddb_2_test: Fail # Issue 3669.