Adds conversion rule for WebAXRoleNone

content/renderer/accessibility/blink_ax_enum_conversion.cc

 // Copyright (c) 2013 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.
 
 #include "content/renderer/accessibility/blink_ax_enum_conversion.h"
 
 #include "base/logging.h"
 
 namespace content {
 
@@ skipping 198 matching lines @@
     case blink::WebAXRoleMenuButton:
       return ui::AX_ROLE_MENU_BUTTON;
     case blink::WebAXRoleMenuItem:
       return ui::AX_ROLE_MENU_ITEM;
     case blink::WebAXRoleMenuListOption:
       return ui::AX_ROLE_MENU_LIST_OPTION;
     case blink::WebAXRoleMenuListPopup:
       return ui::AX_ROLE_MENU_LIST_POPUP;
     case blink::WebAXRoleNavigation:
       return ui::AX_ROLE_NAVIGATION;
+    case blink::WebAXRoleNone:
+      return ui::AX_ROLE_NONE;
     case blink::WebAXRoleNote:
       return ui::AX_ROLE_NOTE;
     case blink::WebAXRoleOutline:
       return ui::AX_ROLE_OUTLINE;
     case blink::WebAXRoleParagraph:
       return ui::AX_ROLE_PARAGRAPH;
     case blink::WebAXRolePopUpButton:
       return ui::AX_ROLE_POP_UP_BUTTON;
     case blink::WebAXRolePresentational:
       return ui::AX_ROLE_PRESENTATIONAL;
@@ skipping 157 matching lines @@
     case blink::WebAXTextDirectionBT:
       return ui::AX_TEXT_DIRECTION_BT;
     default:
       NOTREACHED();
   }
 
   return ui::AX_TEXT_DIRECTION_NONE;
 }
 
 }  // namespace content