Cleanup: Use base/files/file_util.h instead of base/file_util.h in [r-t]*/

tools/perf/clear_system_cache/clear_system_cache_main.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A utility to clear the operating system's cache for a file or directory.
 //
 // USAGE: clear_system_cache [--recurse] <files or directories>
 
 #include <stdio.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
-#include "base/file_util.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/test/test_file_util.h"
 
 void ClearCacheForFile(const base::FilePath& path) {
   VLOG(1) << "Clearing " << path.MaybeAsASCII();
   base::EvictFileFromSystemCache(path);
 }
 
 int main(int argc, const char* argv[]) {
   CommandLine::Init(argc, argv);
@@ skipping 20 matching lines @@
            next = enumerator.Next()) {
         ClearCacheForFile(next);
       }
     } else {
       ClearCacheForFile(path);
     }
   }
 
   return 0;
 }