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

ui/views/controls/menu/menu_config.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 "build/build_config.h"
 #include "ui/base/layout.h"
 #include "ui/native_theme/native_theme.h"
 
@@ skipping 28 matching lines @@
       render_gutter(false),
       show_mnemonics(false),
       scroll_arrow_height(3),
       label_to_accelerator_padding(10),
       item_min_height(0),
       show_accelerators(true),
       always_use_icon_to_label_padding(false),
       align_arrow_and_shortcut(false),
       offset_context_menus(false),
       native_theme(theme),
-      show_delay(400) {
+      show_delay(400),
+      corner_radius(0) {
   // Use 40px tall menu items when running in touch optimized mode.
   // For Windows use 40px tall menu items when running in touch optimized mode.
   if (ui::GetDisplayLayout() == ui::LAYOUT_TOUCH) {
     item_top_margin = item_no_icon_top_margin = 12;
     item_bottom_margin = item_no_icon_bottom_margin = 13;
   }
   Init(theme);
 }
 
 MenuConfig::~MenuConfig() {}
 
 void MenuConfig::AdjustForCommonTheme() {
   render_gutter = false;
   item_top_margin = 6;
   item_bottom_margin = 6;
   separator_height = 15;
   menu_horizontal_border_size = 2;
   menu_vertical_border_size = 8;
 }
 
 }  // namespace views