Avoid heap allocations in IPAddress

net/dns/mojo_host_struct_traits.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_STRUCT_TRAITS_H_
 #define NET_DNS_MOJO_HOST_STRUCT_TRAITS_H_
 
 #include "base/strings/string_piece.h"
 #include "mojo/public/cpp/bindings/enum_traits.h"
 #include "mojo/public/cpp/bindings/struct_traits.h"
@@ skipping 32 matching lines @@
       const std::unique_ptr<net::HostResolver::RequestInfo>& obj) {
     return obj->is_my_ip_address();
   }
 
   static bool Read(net::interfaces::HostResolverRequestInfoDataView obj,
                    std::unique_ptr<net::HostResolver::RequestInfo>* output);
 };
 
 template <>
 struct StructTraits<net::interfaces::IPEndPointDataView, net::IPEndPoint> {
-  static const std::vector<uint8_t>& address(const net::IPEndPoint& obj) {
-    return obj.address().bytes();
+  static const std::vector<uint8_t> address(const net::IPEndPoint& obj) {
+    // TODO(rch): avoid creating a vector here.
+    return obj.address().CopyBytesToVector();
   }
   static uint16_t port(const net::IPEndPoint& obj) { return obj.port(); }
 
   static bool Read(net::interfaces::IPEndPointDataView obj,
                    net::IPEndPoint* out);
 };
 
 template <>
 struct StructTraits<net::interfaces::AddressListDataView, net::AddressList> {
   static std::vector<net::IPEndPoint> addresses(const net::AddressList& obj) {
     return obj.endpoints();
   }
 
   static bool Read(net::interfaces::AddressListDataView data,
                    net::AddressList* out);
 };
 
 }  // namespace mojo
 
 #endif  // NET_DNS_MOJO_HOST_STRUCT_TRAITS_H_