The "Update Chrome" menu item should appear in addition to the About menu.

chrome/app/chrome_dll_resource.h

 // Copyright (c) 2010 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.
 
 //{{NO_DEPENDENCIES}}
 //
 // What began as a Microsoft Visual C++ generated include file is now
 // edited by hand.  Do not generate!!!
 //
 // Used by chrome_dll.rc, Mac nibs, ...
@@ skipping 190 matching lines @@
 #define IDC_IMPORT_SETTINGS             40014
 #define IDC_OPTIONS                     40015
 #define IDC_EDIT_SEARCH_ENGINES         40016
 #define IDC_VIEW_PASSWORDS              40017
 #define IDC_ABOUT                       40018
 #define IDC_HELP_PAGE                   40019
 #define IDC_SHOW_APP_MENU               40020
 #define IDC_MANAGE_EXTENSIONS           40022
 #define IDC_AUTOFILL_DEFAULT            40023
 #define IDC_DEV_TOOLS_INSPECT           40025
+#define IDC_UPGRADE_DIALOG              40026
 
 // Spell-check
 // Insert any additional suggestions before _LAST; these have to be consecutive.
 #define IDC_SPELLCHECK_SUGGESTION_0     41000
 #define IDC_SPELLCHECK_SUGGESTION_1     41001
 #define IDC_SPELLCHECK_SUGGESTION_2     41002
 #define IDC_SPELLCHECK_SUGGESTION_3     41003
 #define IDC_SPELLCHECK_SUGGESTION_4     41004
 #define IDC_SPELLCHECK_SUGGESTION_LAST  IDC_SPELLCHECK_SUGGESTION_4
 #define IDC_SPELLCHECK_MENU             41005
@@ skipping 94 matching lines @@
 // Frame items.
 #define IDC_CONTENT_CONTEXT_RELOADFRAME 50160
 #define IDC_CONTENT_CONTEXT_OPENFRAMENEWTAB 50161
 #define IDC_CONTENT_CONTEXT_OPENFRAMENEWWINDOW 50162
 #define IDC_CONTENT_CONTEXT_OPENFRAMEOFFTHERECORD 50163
 #define IDC_CONTENT_CONTEXT_VIEWFRAMESOURCE 50164
 #define IDC_CONTENT_CONTEXT_VIEWFRAMEINFO 50165
 // Search items.
 #define IDC_CONTENT_CONTEXT_GOTOURL 50170
 #define IDC_CONTENT_CONTEXT_SEARCHWEBFOR 50171