Move file_util to base/files/ directory.

base/rand_util_posix.cc

 // Copyright (c) 2012 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/rand_util.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 
-#include "base/file_util.h"
+#include "base/files/file_util.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 
 namespace {
 
 // We keep the file descriptor for /dev/urandom around so we don't need to
 // reopen it (which is expensive), and since we may not even be able to reopen
 // it if we are later put in a sandbox. This class wraps the file descriptor so
 // we can use LazyInstance to handle opening it on the first access.
 class URandomFd {
@@ skipping 28 matching lines @@
   const bool success =
       ReadFromFD(urandom_fd, static_cast<char*>(output), output_length);
   CHECK(success);
 }
 
 int GetUrandomFD(void) {
   return g_urandom_fd.Pointer()->fd();
 }
 
 }  // namespace base