Made combo boxes into leaf nodes in all platform-specific accessibility trees.

content/browser/accessibility/browser_accessibility.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.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 32 matching lines @@
 }
 
 bool BrowserAccessibility::PlatformIsLeaf() const {
   if (InternalChildCount() == 0)
     return true;
 
   // All of these roles may have children that we use as internal
   // implementation details, but we want to expose them as leaves
   // to platform accessibility APIs.
   switch (GetRole()) {
+    case ui::AX_ROLE_COMBO_BOX:
     case ui::AX_ROLE_LINE_BREAK:
     case ui::AX_ROLE_SLIDER:
     case ui::AX_ROLE_STATIC_TEXT:
     case ui::AX_ROLE_TEXT_FIELD:
       return true;
     default:
       return false;
   }
 }
 
@@ skipping 712 matching lines @@
       }
       need_to_offset_web_area = true;
     }
     parent = parent->GetParent();
   }
 
   return bounds;
 }
 
 }  // namespace content