Cleanup: Remove unneeded base/file_util.h includes in base.

base/files/file_util_proxy.h

 // 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.
 
 #ifndef BASE_FILES_FILE_UTIL_PROXY_H_
 #define BASE_FILES_FILE_UTIL_PROXY_H_
 
 #include "base/base_export.h"
 #include "base/callback_forward.h"
-#include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
 
 namespace tracked_objects {
 class Location;
 };
 
 namespace base {
 
@@ skipping 181 matching lines @@
       PlatformFile,
       const StatusCallback& callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtilProxy);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_UTIL_PROXY_H_