Avoid heap allocations in IPAddress

net/interfaces/ip_address_struct_traits.h

Index: net/interfaces/ip_address_struct_traits.h
diff --git a/net/interfaces/ip_address_struct_traits.h b/net/interfaces/ip_address_struct_traits.h
index 9c97baf8f6f11a02510769c9a406bb364d51f48a..9c7b48e0d4997f0fb093aaaffa4ed41537d8343f 100644
--- a/net/interfaces/ip_address_struct_traits.h
+++ b/net/interfaces/ip_address_struct_traits.h
@@ -12,8 +12,9 @@
 namespace mojo {
 template <>
 struct StructTraits<net::interfaces::IPAddressDataView, net::IPAddress> {
-  static const std::vector<uint8_t>& address(const net::IPAddress& ip_address) {
-    return ip_address.bytes();
+  static const std::vector<uint8_t> address(const net::IPAddress& ip_address) {
+    // TODO(rch): avoid creating a vector here.
+    return ip_address.CopyBytesToVector();
   }
 
   static bool Read(net::interfaces::IPAddressDataView obj, net::IPAddress* out);