Update from https://crrev.com/314320

net/base/net_util_linux.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_LINUX_H_
 #define NET_BASE_NET_UTIL_LINUX_H_
 
 // This file is only used to expose some of the internals
-// of net_util_linux.cc to tests.
+// of net_util_linux.cc to address_tracker_linux and tests.
 
 #include "base/containers/hash_tables.h"
 #include "net/base/address_tracker_linux.h"
 #include "net/base/net_util.h"
 
 namespace net {
 namespace internal {
 
-typedef char* (*GetInterfaceNameFunction)(unsigned int interface_index,
-                                          char* ifname);
+typedef char* (*GetInterfaceNameFunction)(int interface_index, char* ifname);
 
 NET_EXPORT bool GetNetworkListImpl(
     NetworkInterfaceList* networks,
     int policy,
     const base::hash_set<int>& online_links,
     const internal::AddressTrackerLinux::AddressMap& address_map,
     GetInterfaceNameFunction get_interface_name);
 
 }  // namespace internal
 }  // namespace net
 
 #endif  // NET_BASE_NET_UTIL_LINUX_H_