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diff --git a/ipc/chromium/src/base/dir_reader_posix.h b/ipc/chromium/src/base/dir_reader_posix.h
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+++ b/ipc/chromium/src/base/dir_reader_posix.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2010 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_DIR_READER_POSIX_H_
+#define BASE_DIR_READER_POSIX_H_
+#pragma once
+
+#include "build/build_config.h"
+
+// This header provides a class, DirReaderPosix, which allows one to open and
+// read from directories without allocating memory. For the interface, see
+// the generic fallback in dir_reader_fallback.h.
+
+// Mac note: OS X has getdirentries, but it only works if we restrict Chrome to
+// 32-bit inodes. There is a getdirentries64 syscall in 10.6, but it's not
+// wrapped and the direct syscall interface is unstable. Using an unstable API
+// seems worse than falling back to enumerating all file descriptors so we will
+// probably never implement this on the Mac.
+
+#if defined(OS_LINUX)
+#  include "base/dir_reader_linux.h"
+#elif defined(OS_BSD) && !defined(__GLIBC__)
+#  include "base/dir_reader_bsd.h"
+#else
+#  include "base/dir_reader_fallback.h"
+#endif
+
+namespace base {
+
+#if defined(OS_LINUX)
+typedef DirReaderLinux DirReaderPosix;
+#elif defined(OS_BSD) && !defined(__GLIBC__)
+typedef DirReaderBSD DirReaderPosix;
+#else
+typedef DirReaderFallback DirReaderPosix;
+#endif
+
+}  // namespace base
+
+#endif  // BASE_DIR_READER_POSIX_H_