Replace //net TypeConverters with StructTraits.

net/dns/mojo_host_type_converters.h

-// Copyright 2015 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_DNS_MOJO_HOST_TYPE_CONVERTERS_H_
-#define NET_DNS_MOJO_HOST_TYPE_CONVERTERS_H_
-
-#include "net/dns/host_resolver.h"
-#include "net/interfaces/host_resolver_service.mojom.h"
-
-namespace mojo {
-
-template <>
-struct TypeConverter<net::HostResolver::RequestInfo,
-                     net::interfaces::HostResolverRequestInfo> {
-  static net::HostResolver::RequestInfo Convert(
-      const net::interfaces::HostResolverRequestInfo& obj);
-};
-
-template <>
-struct TypeConverter<net::interfaces::HostResolverRequestInfoPtr,
-                     net::HostResolver::RequestInfo> {
-  static net::interfaces::HostResolverRequestInfoPtr Convert(
-      const net::HostResolver::RequestInfo& obj);
-};
-
-template <>
-struct TypeConverter<net::interfaces::AddressListPtr, net::AddressList> {
-  static net::interfaces::AddressListPtr Convert(const net::AddressList& obj);
-};
-
-template <>
-struct TypeConverter<net::AddressList, net::interfaces::AddressList> {
-  static net::AddressList Convert(const net::interfaces::AddressList& obj);
-};
-
-}  // namespace mojo
-
-#endif  // NET_DNS_MOJO_HOST_TYPE_CONVERTERS_H_