Split network_interfaces.h off of net_utils.h.

net/base/net_util_posix.h

-// Copyright (c) 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 NET_BASE_NET_UTIL_POSIX_H_
-#define NET_BASE_NET_UTIL_POSIX_H_
-
-// This file is only used to expose some of the internals of
-// net_util_posix.cc to net_util_linux.cc and net_util_mac.cc.
-
-#include <string>
-
-struct sockaddr;
-
-namespace net {
-namespace internal {
-#if !defined(OS_NACL)
-bool ShouldIgnoreInterface(const std::string& name, int policy);
-bool IsLoopbackOrUnspecifiedAddress(const sockaddr* addr);
-#endif  // !OS_NACL
-
-}  // namespace internal
-}  // namespace net
-
-#endif  // NET_BASE_NET_UTIL_POSIX_H_