Fix MenuModelAdapter clang build

views/controls/menu/menu_model_adapter.cc

 // Copyright (c) 2011 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 "views/controls/menu/menu_model_adapter.h"
 
 #include "base/logging.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/menu_model.h"
 #include "views/controls/menu/submenu_view.h"
 #include "views/views_delegate.h"
 
 namespace views {
 
 MenuModelAdapter::MenuModelAdapter(ui::MenuModel* menu_model)
     : menu_model_(menu_model) {
   DCHECK(menu_model);
 }
 
+MenuModelAdapter::~MenuModelAdapter() {
+}
+
 void MenuModelAdapter::BuildMenu(MenuItemView* menu) {
   DCHECK(menu);
 
   // Clear the menu.
   if (menu->HasSubmenu()) {
     const int subitem_count = menu->GetSubmenu()->child_count();
     for (int i = 0; i < subitem_count; ++i)
       menu->RemoveMenuItemAt(0);
   }
 
@@ skipping 128 matching lines @@
       BuildMenuImpl(item, submodel);
 
       menu_map_[item] = submodel;
     }
   }
 
   menu->set_has_icons(model->HasIcons());
 }
 
 }  // views