Adds conversion rule for WebAXRoleNone

content/browser/accessibility/browser_accessibility_win.cc

 // Copyright (c) 2012 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/browser/accessibility/browser_accessibility_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 3755 matching lines @@
     // TODO(dmazzoni): figure out the proper MSAA role for all of these.
     case ui::AX_ROLE_BROWSER:
     case ui::AX_ROLE_DIRECTORY:
     case ui::AX_ROLE_DRAWER:
     case ui::AX_ROLE_HELP_TAG:
     case ui::AX_ROLE_IGNORED:
     case ui::AX_ROLE_INCREMENTOR:
     case ui::AX_ROLE_LOG:
     case ui::AX_ROLE_MARQUEE:
     case ui::AX_ROLE_MATTE:
+    case ui::AX_ROLE_NONE:
     case ui::AX_ROLE_PRESENTATIONAL:
     case ui::AX_ROLE_RULER_MARKER:
     case ui::AX_ROLE_SHEET:
     case ui::AX_ROLE_SLIDER_THUMB:
     case ui::AX_ROLE_SYSTEM_WIDE:
     case ui::AX_ROLE_VALUE_INDICATOR:
     default:
       ia_role_ = ROLE_SYSTEM_CLIENT;
       break;
   }
@@ skipping 16 matching lines @@
   // The role should always be set.
   DCHECK(!role_name_.empty() || ia_role_);
 
   // If we didn't explicitly set the IAccessible2 role, make it the same
   // as the MSAA role.
   if (!ia2_role_)
     ia2_role_ = ia_role_;
 }
 
 }  // namespace content