Sync up two accessibility enum files: ax_enums.idl and automation.idl

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.
 
 // TODO(nektar): Migrate entire file to Mojoq.
 // 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.
+  // chrome/common/extensions/api/automation.idl. This is enforced
+  // by a PRESUBMIT check.
   //
   // Explanation of the comments next to these events:
   //
   // Web: this event is only used in web content. Unless a specific platform
   //      is specified, it fires a native event on multiple platforms.
   //
   // Native: this event is only used in native UI.
   //
   // Implicit: it would be cleaner if we just updated the AX node
   //     and each platform fired the appropriate events to indicate which
@@ skipping 513 matching lines @@
     // First node is before the second one.
     before,
 
     // Nodes are the same.
     equal,
 
     // First node is after the second one.
     after
   };
 };