Fix menu corners: the menu background was being painted as a rect when in fact,

ui/views/controls/menu/menu_config_views.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/menu/menu_config.h"
 
 #include "grit/ui_resources.h"
 #include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ skipping 29 matching lines @@
   separator_height = 15;
   separator_spacing_height = 7;
   separator_lower_height = 8;
   separator_upper_height = 8;
   font = rb.GetFont(ResourceBundle::BaseFont);
   label_to_arrow_padding = 20;
   label_to_accelerator_padding = 20;
   always_use_icon_to_label_padding = true;
   align_arrow_and_shortcut = true;
   offset_context_menus = true;
+  has_rounded_corners = true;
 }
 
 #if !defined(OS_WIN)
 // static
 const MenuConfig& MenuConfig::instance(const ui::NativeTheme* theme) {
   static MenuConfig* views_instance = NULL;
   if (!views_instance)
     views_instance = new MenuConfig(ui::NativeTheme::instance());
   return *views_instance;
 }
 #endif
 
 }  // namespace views