Revert of Implement ScopedFD in terms of ScopedGeneric.

base/files/scoped_file.h

-// Copyright 2014 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_SCOPED_FILE_H_
-#define BASE_FILES_SCOPED_FILE_H_
-
-#include <stdio.h>
-
-#include "base/base_export.h"
-#include "base/logging.h"
-#include "base/scoped_generic.h"
-#include "build/build_config.h"
-
-namespace base {
-
-namespace internal {
-
-#if defined(OS_POSIX)
-struct BASE_EXPORT ScopedFDCloseTraits {
-  static int InvalidValue() {
-    return -1;
-  }
-  static void Free(int fd);
-};
-#endif
-
-}  // namespace internal
-
-#if defined(OS_POSIX)
-// A low-level Posix file descriptor closer class. Use this when writing
-// platform-specific code, especially that does non-file-like things with the
-// FD (like sockets).
-//
-// If you're writing low-level Windows code, see base/win/scoped_handle.h
-// which provides some additional functionality.
-//
-// If you're writing cross-platform code that deals with actual files, you
-// should generally use base::File instead which can be constructed with a
-// handle, and in addition to handling ownership, has convenient cross-platform
-// file manipulation functions on it.
-typedef ScopedGeneric<int, internal::ScopedFDCloseTraits> ScopedFD;
-#endif
-
-}  // namespace base
-
-#endif  // BASE_FILES_SCOPED_FILE_H_