Avoid heap allocations in IPAddress

net/dns/mojo_host_struct_traits.h

Index: net/dns/mojo_host_struct_traits.h
diff --git a/net/dns/mojo_host_struct_traits.h b/net/dns/mojo_host_struct_traits.h
index 307e1b22ba8371aa75bb145abc95825e6270c523..ca7e2f46886762a17dbf3fb12029828e1b5cfad1 100644
--- a/net/dns/mojo_host_struct_traits.h
+++ b/net/dns/mojo_host_struct_traits.h
@@ -50,8 +50,9 @@ struct StructTraits<net::interfaces::HostResolverRequestInfoDataView,
 
 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(); }