Remove non-420 configure option.

Change-Id: Ic130a77cb77c780bea9d5a3fc7c7dccd3c77f0dd

configure

diff --git a/configure b/configure
index fea9129..3eef836 100755
--- a/configure
+++ b/configure
@@ -267,7 +267,6 @@
 "
 EXPERIMENT_LIST="
     multiple_arf
-    non420
     alpha
 "
 CONFIG_LIST="