Return blank strings for Views Combobox separator items.

ui/views/controls/combobox/combobox.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 "ui/views/controls/combobox/combobox.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/base/accessibility/accessible_view_state.h"
@@ skipping 160 matching lines @@
 
 int Combobox::GetSelectedRow() {
   return selected_index_;
 }
 
 void Combobox::SetSelectedRow(int row) {
   SetSelectedIndex(row);
 }
 
 string16 Combobox::GetTextForRow(int row) {
-  return model()->GetItemAt(row);
+  return model()->IsItemSeparatorAt(row) ? string16() : model()->GetItemAt(row);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Combobox, View overrides:
 
 gfx::Size Combobox::GetPreferredSize() {
   if (content_size_.IsEmpty())
     UpdateFromModel();
 
   // The preferred size will drive the local bounds which in turn is used to set
@@ skipping 267 matching lines @@
 
 int Combobox::MenuCommandToIndex(int menu_command_id) const {
   // (note that the id received is offset by kFirstMenuItemId)
   // Revert menu ID offset to map back to combobox model.
   int index = menu_command_id - kFirstMenuItemId;
   DCHECK_LT(index, model()->GetItemCount());
   return index;
 }
 
 }  // namespace views