Write the AV1 fourcc code to the IVF file header.

0x30395056 ("VP90" in little endian) is the VP9 fourcc code.

Change-Id: I603c95f0bf9a172049e214218c0cbde0ddea8691
diff --git a/test/resize_test.cc b/test/resize_test.cc
index 39e7d1b..140de69 100644
--- a/test/resize_test.cc
+++ b/test/resize_test.cc
@@ -12,6 +12,7 @@
 #include <climits>
 #include <vector>
 #include "aom_dsp/aom_dsp_common.h"
+#include "common/tools_common.h"
 #include "third_party/googletest/src/googletest/include/gtest/gtest.h"
 #include "test/codec_factory.h"
 #include "test/encode_test_driver.h"
@@ -47,7 +48,7 @@
   header[3] = 'F';
   mem_put_le16(header + 4, 0);                    /* version */
   mem_put_le16(header + 6, 32);                   /* headersize */
-  mem_put_le32(header + 8, 0x30395056);           /* fourcc (av1) */
+  mem_put_le32(header + 8, AV1_FOURCC);           /* fourcc (av1) */
   mem_put_le16(header + 12, cfg->g_w);            /* width */
   mem_put_le16(header + 14, cfg->g_h);            /* height */
   mem_put_le32(header + 16, cfg->g_timebase.den); /* rate */