Changes wrench menu button to show system menu on space. This matches

chrome/browser/ui/views/app_menu_button_win.h

+// 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.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_APP_MENU_BUTTON_WIN_H_
+#define CHROME_BROWSER_UI_VIEWS_APP_MENU_BUTTON_WIN_H_
+#pragma once
+
+#include "views/controls/button/menu_button.h"
+
+// Button used for showing the app menu. Special cases space to show the system
+// menu.
+class AppMenuButtonWin : public views::MenuButton {
+ public:
+  explicit AppMenuButtonWin(views::ViewMenuDelegate* menu_delegate);
+
+  // MenuButton:
+  virtual bool OnKeyPressed(const views::KeyEvent& event) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppMenuButtonWin);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_APP_MENU_BUTTON_WIN_H_