Switch to standard integer types in base/files/.

BUG=138542
[email protected]

Review URL: https://codereview.chromium.org/1549853002

Cr-Commit-Position: refs/heads/master@{#366804}
diff --git a/base/files/file_locking_unittest.cc b/base/files/file_locking_unittest.cc
index 7f41bba..d9a1755 100644
--- a/base/files/file_locking_unittest.cc
+++ b/base/files/file_locking_unittest.cc
@@ -6,6 +6,7 @@
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
+#include "base/macros.h"
 #include "base/test/multiprocess_test.h"
 #include "base/test/test_timeouts.h"
 #include "base/threading/platform_thread.h"