missed that file for last checkin

configure.in

@@ -3572,13 +3572,6 @@ if test "$_DETECT_WEBSHELL_LEAKS"; then
   AC_SUBST(DETECT_WEBSHELL_LEAKS)
 fi
 
-dnl ========================================================
-dnl = Turn off double buffering
-dnl ========================================================
-MOZ_ARG_DISABLE_BOOL(double-buffer,
-[  --disable-double-buffer Disable double buffering],
-    AC_DEFINE(NO_DOUBLE_BUFFER))
-
 dnl ========================================================
 dnl = Use malloc wrapper lib
 dnl ========================================================