remove hand-rolled pop3 timeout code, sr=mscott, a=shaver 295765

mailnews/mailnews.js

@@ -113,7 +113,6 @@ pref("mail.default_cc",                     "");
 pref("mail.default_fcc",                    ""); // maibox:URL or Imap://Host/OnLineFolderName
 pref("mail.check_new_mail",                 false);
 pref("mail.pop3_gets_new_mail",             false);
-pref("mail.pop3_response_timeout",          45); // in seconds
 pref("mail.check_time",                     10);
 pref("mail.pop_name",                       "");
 pref("mail.remember_password",              false);