MD Settings: add "Use system title bar and borders"

chrome/app/chrome_command_ids.h

 // 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.
 
 #ifndef CHROME_APP_CHROME_COMMAND_IDS_H_
 #define CHROME_APP_CHROME_COMMAND_IDS_H_
 
 // This file lists all the command IDs understood by e.g. the browser.
 // It is used by Windows RC files, Mac NIB files, and other platforms too.
 
@@ skipping 56 matching lines @@
 #define IDC_MOVE_TAB_NEXT               34032
 #define IDC_MOVE_TAB_PREVIOUS           34033
 #define IDC_SEARCH                      34035
 #define IDC_DEBUG_FRAME_TOGGLE          34038
 #define IDC_WINDOW_MENU                 34045
 #define IDC_MINIMIZE_WINDOW             34046
 #define IDC_MAXIMIZE_WINDOW             34047
 #define IDC_ALL_WINDOWS_FRONT           34048
 #define IDC_VISIT_DESKTOP_OF_LRU_USER_2 34049
 #define IDC_VISIT_DESKTOP_OF_LRU_USER_3 34050
+
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #define IDC_USE_SYSTEM_TITLE_BAR        34051
+#endif
 
 // Page-related commands
 #define IDC_BOOKMARK_PAGE               35000
 #define IDC_BOOKMARK_ALL_TABS           35001
 #define IDC_VIEW_SOURCE                 35002
 #define IDC_PRINT                       35003
 #define IDC_SAVE_PAGE                   35004
 #define IDC_ENCODING_MENU               35005
 #define IDC_EMAIL_PAGE_LOCATION         35006
 #define IDC_BASIC_PRINT                 35007
@@ skipping 307 matching lines @@
 // See http://msdn.microsoft.com/en-us/library/t2zechd4(VS.71).aspx
 
 // Starting command id for menus showing bookmarks (such as the wrench menu).
 // While command ids passed to Windows functions must not be higher than 0xDFFF,
 // these IDs are not exposed to the native system and thus can be in this
 // otherwise-reserved range. No command used in a menu (such as the wrench menu)
 // should be higher than this, otherwise it'll conflict.
 #define IDC_FIRST_BOOKMARK_MENU 0xE000
 
 #endif  // CHROME_APP_CHROME_COMMAND_IDS_H_