Fix 27748, unable to type "n" in text areas inside of message pane. Temporarily removed "N" keybinding for Next Unread Message menu item. r=sspitzer.

mailnews/base/resources/content/messenger.xul

@@ -114,7 +114,7 @@ Rights Reserved.
 	<key id="key_selectAll"/>
 	<key id="key_preferences"/>
   
-	<key id="key_nextUnreadMsg" key="&nextUnreadMsgCmd.key;" observes="cmd_NextUnreadMsg"/>
+	<!--key id="key_nextUnreadMsg" key="&nextUnreadMsgCmd.key;" observes="cmd_NextUnreadMsg"/-->
 </keyset>
 
 <popupset>
@@ -591,7 +591,7 @@ Rights Reserved.
       <menu value="&nextMenu.label;">
         <menupopup>
 		<menuitem value="&nextMsgCmd.label;" oncommand="MsgNextMessage();"/>
-        <menuitem value="&nextUnreadMsgCmd.label;" key="key_nextUnreadMsg" observes="cmd_nextUnreadMsg"/>
+        <menuitem value="&nextUnreadMsgCmd.label;" observes="cmd_nextUnreadMsg"/>
         <menuitem value="&nextFlaggedMsgCmd.label;" oncommand="MsgNextFlaggedMessage();"/>
 		<menuseparator/>
 		<menuitem value="&nextUnreadThread.label;" oncommand="MsgNextUnreadThread();"/>