Restructure public side of network service.

mojo/services/public/interfaces/network/net_address.mojom

-// 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.
-
-module mojo;
-
-enum NetAddressFamily {
-  UNSPECIFIED,
-  IPV4,
-  IPV6
-};
-
-struct NetAddressIPv4 {
-  // The port number. This is in the local machine's endianness.
-  uint16 port;
-
-  // The address is expressed in network byte order, so the most significant
-  // byte ("127" in the address "127.0.0.1") will be at index 0.
-  array<uint8, 4> addr;
-};
-
-// All members are expressed in network byte order.
-struct NetAddressIPv6 {
-  // The port number. This is in the local machine's endianness.
-  uint16 port;
-
-  // The address is expressed in network byte order, so the most significant
-  // byte is at index 0.
-  array<uint8, 16> addr;
-};
-
-struct NetAddress {
-  NetAddressFamily family = UNSPECIFIED;
-
-  // At most one of the following fields is non-NULL depending on the value of
-  // |family|.
-  NetAddressIPv4? ipv4;
-  NetAddressIPv6? ipv6;
-};