Update from https://crrev.com/327068

base/files/file_posix_hooks_internal.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_FILE_POSIX_HOOKS_INTERNAL_H_
-#define BASE_FILES_FILE_POSIX_HOOKS_INTERNAL_H_
-
-#include "base/base_export.h"
-
-namespace base {
-
-// Define empty hooks for blacklisting file descriptors used in base::File.
-// These functions should be declared 'weak', i.e. the functions declared in
-// a default way would have precedence over the weak ones at link time. This
-// works for both static and dynamic linking.
-// TODO(pasko): Remove these hooks when crbug.com/424562 is fixed.
-//
-// With compilers other than GCC/Clang define strong no-op symbols for
-// simplicity.
-#if defined(COMPILER_GCC)
-#define ATTRIBUTE_WEAK __attribute__ ((weak))
-#else
-#define ATTRIBUTE_WEAK
-#endif
-BASE_EXPORT void ProtectFileDescriptor(int fd) ATTRIBUTE_WEAK;
-BASE_EXPORT void UnprotectFileDescriptor(int fd) ATTRIBUTE_WEAK;
-#undef ATTRIBUTE_WEAK
-
-}  // namespace base
-
-#endif  // BASE_FILES_FILE_POSIX_HOOKS_INTERNAL_H_