mac: Update menu item command IDs in MainMenu.xib.

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_
 #pragma once
 
 // 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.
 
+// Mac NIB files (e.g. chrome/app/nibs/MainMenu.xib) include ID numbers rather
+// than the corresponding #define labels.  If you change a given command's
+// number, any NIB files that refer to it will also need to be updated.
+
 // Values below IDC_MinimumLabelValue are reserved for dynamic menu items.
 #define IDC_MinimumLabelValue           4000
 
 #define IDC_Messages                    4000
 #define IDC_MessagesAll                 4007
 #define IDC_MessagesNone                4008
 
 // NOTE: Within each of the following sections, the IDs are ordered roughly by
 // how they appear in the GUI/menus (left to right, top to bottom, etc.).
 
@@ skipping 290 matching lines @@
 
 // Protocol handler menu entries
 #define IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_FIRST     52000
 #define IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_LAST      52199
 #define IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_SETTINGS  52200
 
 // NOTE: The last valid command value is 57343 (0xDFFF)
 // See http://msdn.microsoft.com/en-us/library/t2zechd4(VS.71).aspx
 
 #endif  // CHROME_APP_CHROME_COMMAND_IDS_H_