backup for dynamic recent tabs submenu

ui/base/models/simple_menu_model.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/base/models/simple_menu_model.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image.h"
@@ skipping 220 matching lines @@
                 NORMAL_SEPARATOR };
   InsertItemAtIndex(item, index);
 }
 
 void SimpleMenuModel::InsertSubMenuWithStringIdAt(
     int index, int command_id, int string_id, MenuModel* model) {
   InsertSubMenuAt(index, command_id, l10n_util::GetStringUTF16(string_id),
                   model);
 }
 
+void SimpleMenuModel::RemoveItemAt(int index) {
+  items_.erase(items_.begin() + ValidateItemIndex(index));
+  MenuItemsChanged();
+}
+
 void SimpleMenuModel::SetIcon(int index, const gfx::Image& icon) {
   items_[ValidateItemIndex(index)].icon = icon;
   MenuItemsChanged();
 }
 
 void SimpleMenuModel::SetSublabel(int index, const base::string16& sublabel) {
   items_[ValidateItemIndex(index)].sublabel = sublabel;
   MenuItemsChanged();
 }
 
@@ skipping 196 matching lines @@
 #ifndef NDEBUG
   if (item.type == TYPE_SEPARATOR) {
     DCHECK_EQ(item.command_id, kSeparatorId);
   } else {
     DCHECK_GE(item.command_id, 0);
   }
 #endif  // NDEBUG
 }
 
 }  // namespace ui