Remove unused roles(EditableText, SplitGroup, GrowArea) from Chromium.

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 78 matching lines @@
     description_list_detail,
     description_list,
     description_list_term,
     desktop,
     details,
     dialog,
     directory,
     disclosure_triangle,
     div,
     document,
-    editable_text,
     embedded_object,
     figcaption,
     figure,
     footer,
     form,
     grid,
     group,
-    grow_area,
     heading,
     iframe,
     ignored,
     image_map_link,
     image_map,
     image,
     inline_text_box,
     label_text,
     legend,
     link,
@@ skipping 35 matching lines @@
     ruler,
     svg_root,
     scroll_area,
     scroll_bar,
     seamless_web_area,
     search,
     slider,
     slider_thumb,
     spin_button_part,
     spin_button,
-    split_group,
     splitter,
     static_text,
     status,
     tab_group,
     tab_list,
     tab_panel,
     tab,
     table_header_container,
     table,
     text_area,
@@ skipping 205 matching lines @@
     word_ends
   };
 
   [cpp_enum_prefix_override="ax"] enum AXTextDirection {
     text_direction_lr,
     text_direction_rl,
     text_direction_tb,
     text_direction_bt
   };
 };