Remove ext_intra experimental flag

Change-Id: I69e07309b708caa59c313ae2156828d8c089cf4d
diff --git a/av1/encoder/block.h b/av1/encoder/block.h
index 8826a0c..c01601b 100644
--- a/av1/encoder/block.h
+++ b/av1/encoder/block.h
@@ -326,9 +326,9 @@
   int inter_tx_type_costs[EXT_TX_SETS_INTER][EXT_TX_SIZES][TX_TYPES];
   int intra_tx_type_costs[EXT_TX_SETS_INTRA][EXT_TX_SIZES][INTRA_MODES]
                          [TX_TYPES];
-#if CONFIG_EXT_INTRA && CONFIG_EXT_INTRA_MOD
+#if CONFIG_EXT_INTRA_MOD
   int angle_delta_cost[DIRECTIONAL_MODES][2 * MAX_ANGLE_DELTA + 1];
-#endif  // CONFIG_EXT_INTRA && CONFIG_EXT_INTRA_MOD
+#endif  // CONFIG_EXT_INTRA_MOD
 #if CONFIG_LOOP_RESTORATION
   int switchable_restore_cost[RESTORE_SWITCHABLE_TYPES];
   int wiener_restore_cost[2];