switch to using android-base/file.h instead of android-base/test_utils.h

Test: compile
Bug: 119313545
Change-Id: I664fb32522d01909c603d7b903475c4e9aea9223
diff --git a/benchmarks/stdio_benchmark.cpp b/benchmarks/stdio_benchmark.cpp
index 21d9dc0..037bbd9 100644
--- a/benchmarks/stdio_benchmark.cpp
+++ b/benchmarks/stdio_benchmark.cpp
@@ -20,7 +20,7 @@
 #include <stdio_ext.h>
 #include <stdlib.h>
 
-#include <android-base/test_utils.h>
+#include <android-base/file.h>
 #include <benchmark/benchmark.h>
 #include "util.h"