ARIA role region is not exposed correct with MSAA+IA2 role

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 3672 matching lines @@
       ia_state_ |= STATE_SYSTEM_READONLY;
       break;
     case ui::AX_ROLE_RADIO_BUTTON:
       ia_role_ = ROLE_SYSTEM_RADIOBUTTON;
       break;
     case ui::AX_ROLE_RADIO_GROUP:
       ia_role_ = ROLE_SYSTEM_GROUPING;
       ia2_role_ = IA2_ROLE_SECTION;
       break;
     case ui::AX_ROLE_REGION:
-      ia_role_ = ROLE_SYSTEM_GROUPING;
-      ia2_role_ = IA2_ROLE_SECTION;
-      ia_state_ |= STATE_SYSTEM_READONLY;
+      if (html_tag == L"section") {
+        ia_role_ = ROLE_SYSTEM_GROUPING;
+        ia2_role_ = IA2_ROLE_SECTION;
+      } else {
+        ia_role_ = ROLE_SYSTEM_PANE;
+      }
       break;
     case ui::AX_ROLE_ROW:
       ia_role_ = ROLE_SYSTEM_ROW;
       ia_state_ |= STATE_SYSTEM_READONLY;
       break;
     case ui::AX_ROLE_ROW_HEADER:
       ia_role_ = ROLE_SYSTEM_ROWHEADER;
       ia_state_ |= STATE_SYSTEM_READONLY;
       break;
     case ui::AX_ROLE_RULER:
@@ skipping 150 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