Bug 571842 - add classes to split menu for CSS addressability. r=dao

--HG--
extra : rebase_source : 29efb4b168ed74a99d53cf5d254af3aad2407daa

browser/base/content/browser.xul

@@ -401,8 +401,9 @@
         <menuitem id="appmenu_sendLink"
                   label="&sendPageCmd.label;"
                   command="Browser:SendLink"/>
-        <hbox flex="1">
+        <hbox flex="1" class="split-menuitem">
           <menuitem id="appmenu_print"
+                    class="split-menuitem-item"
                     flex="1"
                     label="&appMenuPrintCmd.label;"
                     key="printKb"