Update from https://crrev.com/304418

net/base/net_util_mac.h

Index: net/base/net_util_mac.h
diff --git a/net/base/net_util_mac.h b/net/base/net_util_mac.h
new file mode 100644
index 0000000000000000000000000000000000000000..178faccbcc9e782486bc03da26403fea0be9dac7
--- /dev/null
+++ b/net/base/net_util_mac.h
@@ -0,0 +1,42 @@
+// 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_MAC_H_
+#define NET_BASE_NET_UTIL_MAC_H_
+
+// This file is only used to expose some of the internals
+// of net_util_mac.cc to tests.
+
+#include "base/macros.h"
+#include "net/base/net_export.h"
+#include "net/base/net_util.h"
+
+struct ifaddrs;
+struct sockaddr;
+
+namespace net {
+namespace internal {
+
+class NET_EXPORT IPAttributesGetterMac {
+ public:
+  IPAttributesGetterMac() {}
+  virtual ~IPAttributesGetterMac() {}
+  virtual bool IsInitialized() const = 0;
+  virtual bool GetIPAttributes(const char* ifname,
+                               const sockaddr* sock_addr,
+                               int* native_attributes) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(IPAttributesGetterMac);
+};
+
+NET_EXPORT bool GetNetworkListImpl(NetworkInterfaceList* networks,
+                                   int policy,
+                                   const ifaddrs* interfaces,
+                                   IPAttributesGetterMac* ip_attributes_getter);
+
+}  // namespace internal
+}  // namespace net
+
+#endif  // NET_BASE_NET_UTIL_MAC_H_