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

ui/base/win/hwnd_util.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 UI_BASE_WIN_HWND_UTIL_H_
 #define UI_BASE_WIN_HWND_UTIL_H_
 #pragma once
 
 #include <windows.h>
 
@@ skipping 26 matching lines @@
 // window fits on screen.
 void CenterAndSizeWindow(HWND parent,
                          HWND window,
                          const gfx::Size& pref,
                          bool pref_is_client);
 
 // If |hwnd| is NULL logs various thing and CHECKs. Invoke right after calling
 // CreateWindow.
 void CheckWindowCreated(HWND hwnd);
 
+// Shows the system menu for |window| and sends the selected command (if the
+// user selected something.
+void ShowSystemMenu(HWND window, int screen_x, int screen_y);
+
 }  // namespace ui
 
 #endif  // UI_BASE_WIN_HWND_UTIL_H_