Move file_util to base/files/ directory.

base/test/test_file_util_mac.cc

 // Copyright (c) 2011 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.
 
 #include "base/test/test_file_util.h"
 
 #include <sys/mman.h>
 #include <errno.h>
 
+#include "base/files/file_util.h"
+#include "base/files/memory_mapped_file.h"
 #include "base/logging.h"
-#include "base/file_util.h"
-#include "base/files/memory_mapped_file.h"
 
 namespace base {
 
 bool EvictFileFromSystemCache(const FilePath& file) {
   // There aren't any really direct ways to purge a file from the UBC.  From
   // talking with Amit Singh, the safest is to mmap the file with MAP_FILE (the
   // default) + MAP_SHARED, then do an msync to invalidate the memory.  The next
   // open should then have to load the file from disk.
 
   int64 length;
@@ skipping 19 matching lines @@
             MS_INVALIDATE) != 0) {
     DLOG(WARNING) << "failed to invalidate memory map of " << file.value()
                   << ", errno: " << errno;
     return false;
   }
 
   return true;
 }
 
 }  // namespace base