HTML Ruby tag is not exposed on Windows

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 133 matching lines @@
     pop_up_button,
     pre,
     presentational,
     progress_indicator,
     radio_button,
     radio_group,
     region,
     root_web_area,
     row_header,
     row,
+    ruby,
     ruler_marker,
     ruler,
     svg_root,
     scroll_area,
     scroll_bar,
     seamless_web_area,
     search,
     sheet,
     slider,
     slider_thumb,
@@ skipping 220 matching lines @@
     word_ends
   };
 
   [cpp_enum_prefix_override="ax"] enum AXTextDirection {
     text_direction_lr,
     text_direction_rl,
     text_direction_tb,
     text_direction_bt
   };
 };