Some code clean-up.

Change-Id: I4b745fd5298cd61c793e3b57514b48347bd66c0e
diff --git a/compiler/elf_writer_test.cc b/compiler/elf_writer_test.cc
index e479322..2ffbd10 100644
--- a/compiler/elf_writer_test.cc
+++ b/compiler/elf_writer_test.cc
@@ -17,6 +17,7 @@
 #include "elf_file.h"
 
 #include "base/stringprintf.h"
+#include "base/unix_file/fd_file.h"
 #include "common_compiler_test.h"
 #include "oat.h"
 #include "utils.h"