Cosmetics - Fix header file order in unit tests

Change-Id: I9582a8d74990125b71e8fe620f7f3f2585a30798
diff --git a/test/sad_test.cc b/test/sad_test.cc
index 1c17bfe..e6a5e0b 100644
--- a/test/sad_test.cc
+++ b/test/sad_test.cc
@@ -13,18 +13,17 @@
 #include <limits.h>
 #include <stdio.h>
 
+#include "third_party/googletest/src/include/gtest/gtest.h"
+
 #include "./vpx_config.h"
 #include "./vpx_dsp_rtcd.h"
-#include "vpx_mem/vpx_mem.h"
-#include "vpx_ports/mem.h"
-
 #include "test/acm_random.h"
 #include "test/clear_system_state.h"
 #include "test/register_state_check.h"
 #include "test/util.h"
-#include "third_party/googletest/src/include/gtest/gtest.h"
 #include "vpx/vpx_codec.h"
-
+#include "vpx_mem/vpx_mem.h"
+#include "vpx_ports/mem.h"
 
 typedef unsigned int (*SadMxNFunc)(const uint8_t *src_ptr,
                                    int src_stride,