Fix menu list and list box screen reader accessibility.

content/renderer/accessibility/renderer_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/renderer/accessibility/renderer_accessibility.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 217 matching lines @@
     // If it's ignored, find the first ancestor that's not ignored.
     while (!obj.isDetached() && obj.accessibilityIsIgnored())
       obj = obj.parentObject();
 
     // Make sure it's a descendant of our root node - exceptions include the
     // scroll area that's the parent of the main document (we ignore it), and
     // possibly nodes attached to a different document.
     if (!tree_source_.IsInTree(obj))
       continue;
 
-    // When we get a "selected children changed" event, Blink
-    // doesn't also send us events for each child that changed
-    // selection state, so make sure we re-send that whole subtree.
-    if (event.event_type == ui::AX_EVENT_SELECTED_CHILDREN_CHANGED) {
-      serializer_.DeleteClientSubtree(obj);
-    }
-
     AccessibilityHostMsg_EventParams event_msg;
     tree_source_.CollectChildFrameIdMapping(
         &event_msg.node_to_frame_routing_id_map,
         &event_msg.node_to_browser_plugin_instance_id_map);
     event_msg.event_type = event.event_type;
     event_msg.id = event.id;
     serializer_.SerializeChanges(obj, &event_msg.update);
     event_msgs.push_back(event_msg);
 
     // For each node in the update, set the location in our map from
@@ skipping 231 matching lines @@
     LOG(WARNING) << "SetTextSelection on invalid object id " << acc_obj_id;
 #endif
     return;
   }
 
   obj.setValue(value);
   HandleAXEvent(obj, ui::AX_EVENT_VALUE_CHANGED);
 }
 
 }  // namespace content