Fix include order

Fix a code review comment that came in after submit of aog/940389.

Bug: None
Test: make test-art-host-gtest-dexlayout_test
Change-Id: I093440a027541f94a96c594a624757c2f2c7948c
diff --git a/dexlayout/dexlayout_test.cc b/dexlayout/dexlayout_test.cc
index 0964619..fb1c846 100644
--- a/dexlayout/dexlayout_test.cc
+++ b/dexlayout/dexlayout_test.cc
@@ -21,9 +21,9 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "base/common_art_test.h"
 #include "base/unix_file/fd_file.h"
 #include "base/utils.h"
-#include "base/common_art_test.h"
 #include "dex/art_dex_file_loader.h"
 #include "dex/base64_test_util.h"
 #include "dex/class_accessor-inl.h"