Less strict checked state changes and introduce disabled state for content

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 177 matching lines @@
     tree_grid,
     tree_item,
     tree,
     unknown,
     tooltip,
     web_area,
     web_view,
     window
   };
 
-  // TODO(dmazzoni): switch content/ to use AX_STATE_DISABLED instead of
-  // !AX_STATE_ENABLED.
   enum AXState {
     busy,
     checked,
     collapsed,
     default,
-    disabled,  // ui/views only
+    disabled,
     editable,
-    enabled,   // content only
     expanded,
     focusable,
     haspopup,
     horizontal,
     hovered,
     invisible,
     linked,
     multiline,
     multiselectable,
     offscreen,
@@ skipping 287 matching lines @@
     swipe_left_3,
     swipe_up_3,
     swipe_right_3,
     swipe_down_3,
     swipe_left_4,
     swipe_up_4,
     swipe_right_4,
     swipe_down_4
   };
 };