ARIA state/property(aria-relevant,aria-busy) are not exposed correctly on MAC.

ui/accessibility/ax_enums.idl

 // Copyright 2014 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.
 
 // These should be kept in sync with third_party/WebKit/public/web/WebAXEnums.h
 // until the Chromium and Blink trees are merged.
 [camel_case_enum_to_string=true] namespace ui {
 
   // For new entries to the following three enums, also add to
   // chrome/common/extensions/api/automation.idl.
@@ skipping 303 matching lines @@
 
   [cpp_enum_prefix_override="ax_attr"] enum AXBoolAttribute {
     // Document attributes.
     doc_loaded,
 
     // True if a checkbox or radio button is in the "mixed" state.
     button_mixed,
 
     // Live region attributes.
     container_live_atomic,
-    container_live_busy,
     live_atomic,
     live_busy,
 
     // ARIA readonly flag.
     aria_readonly,
 
     // Writeable attributes
     can_set_value,
 
     // If this is set, all of the other fields in this struct should
@@ skipping 49 matching lines @@
     word_ends
   };
 
   [cpp_enum_prefix_override="ax"] enum AXTextDirection {
     text_direction_lr,
     text_direction_rl,
     text_direction_tb,
     text_direction_bt
   };
 };