Replace ButtonDropDown menu implementation (Menu2) with MenuItemView.

views/controls/menu/menu_model_adapter_unittest.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 "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/base/models/menu_model_delegate.h"
 #include "views/controls/menu/menu_item_view.h"
 #include "views/controls/menu/menu_model_adapter.h"
 #include "views/controls/menu/submenu_view.h"
@@ skipping 275 matching lines @@
       case ui::MenuModel::TYPE_SUBMENU:
         EXPECT_EQ(views::MenuItemView::SUBMENU, item->GetType());
         break;
     }
 
     // Check activation.
     static_cast<views::MenuDelegate*>(&delegate)->ExecuteCommand(id);
     EXPECT_EQ(i + kFirstItemIndex, submodel->last_activation());
     submodel->set_last_activation(-1);
   }
+
+  // Check that selecting the root item is safe.  The MenuModel does
+  // not care about the root so MenuModelAdapter should do nothing
+  // (not hit the NOTREACHED check) when the root is selected.
+  static_cast<views::MenuDelegate*>(&delegate)->SelectionChanged(menu.get());
 }
 
 }  // namespace views