Disable an obsolete test when OBU is enabled

The OBU experiment has removed the parsing of super frame indices, so
the test is obsolete when OBU is enabled.

BUG=aomedia:1213

Change-Id: If7d1873f3f41fa9146f9451687eda92b39b035a5

test/superframe_test.cc

diff --git a/test/superframe_test.cc b/test/superframe_test.cc
index eec1a16..1b5bfa3 100644
--- a/test/superframe_test.cc
+++ b/test/superframe_test.cc
@@ -118,7 +118,8 @@
 
 // The superframe index is currently mandatory with both ANS and DAALA_EC due
 // to the decoder starting at the end of the buffer.
-#if CONFIG_EXT_TILE
+#if CONFIG_EXT_TILE && !CONFIG_OBU
+// TODO(yaowu): remove this test once OBU is fully merged in AV1
 // Single tile does not work with ANS (see comment above).
 const int tile_col_values[] = { 1, 2 };
 const int tile_row_values[] = { 1, 2, 32 };