lint code

shadowsocks-csharp/View/MenuViewController.cs

@@ -5,7 +5,6 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Drawing;
-using System.IO;
 using System.Text;
 using System.Windows.Forms;
 
@@ -188,7 +187,7 @@ namespace Shadowsocks.View
             _notifyIcon.ShowBalloonTip(timeout);
         }
 
-        void controller_UpdatePACFromGFWListError(object sender, ErrorEventArgs e)
+        void controller_UpdatePACFromGFWListError(object sender, System.IO.ErrorEventArgs e)
         {
             ShowBalloonTip(I18N.GetString("Failed to update PAC file"), e.GetException().Message, ToolTipIcon.Error, 5000);
             Logging.LogUsefulException(e.GetException());