Cleanup: Use base/files/file_util.h instead of base/file_util.h in ash/, athena/, and chromeos/

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Review URL: https://codereview.chromium.org/555313002

Cr-Commit-Position: refs/heads/master@{#294072}
diff --git a/chromeos/chromeos_paths.cc b/chromeos/chromeos_paths.cc
index f629c45c..659c240 100644
--- a/chromeos/chromeos_paths.cc
+++ b/chromeos/chromeos_paths.cc
@@ -4,8 +4,8 @@
 
 #include "chromeos/chromeos_paths.h"
 
-#include "base/file_util.h"
 #include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/sys_info.h"