remove check for updates menu item from the tools menu (thanks mconnor!)

browser/base/content/browser-menubar.inc

@@ -418,10 +418,6 @@
               <menuitem accesskey="&pageInfoCmd.accesskey;" label="&pageInfoCmd.label;"   
                         key="key_viewInfo" command="View:PageInfo"/>
 #endif
-              <menuseparator id="updateSeparator"/>
-              <menuitem id="updateItem" label="&updateMenu.label;"
-                        accesskey="&updateMenu.accesskey;"
-                        oncommand="checkForUpdates();"/>
               <menuseparator id="sanitizeSeparator"/>
               <menuitem id="sanitizeItem" 
                         accesskey="&sanitizeCmd.accesskey;" label="&sanitizeCmd.label;"

browser/locales/en-US/chrome/browser/browser.dtd

@@ -124,8 +124,6 @@
 <!ENTITY themes.label                 "Themes">
 <!ENTITY themes.tooltip               "Change the Theme">
 <!ENTITY themes.accesskey             "T">
-<!ENTITY updateMenu.label             "Check for Updates...">
-<!ENTITY updateMenu.accesskey         "U">
 
 <!ENTITY javaConsoleCmd.label         "Java Console">
 <!ENTITY javaConsoleCmd.accesskey     "J">