[Extensions] Code cleanup - const &s

extensions/browser/api/system_network/system_network_api.cc

Index: extensions/browser/api/system_network/system_network_api.cc
diff --git a/extensions/browser/api/system_network/system_network_api.cc b/extensions/browser/api/system_network/system_network_api.cc
index ece1ebbe9ff2ff1c7357dba649a0c539404ed7d7..38b5a251d77ad9e03b021eca31b7ecc41d4d942a 100644
--- a/extensions/browser/api/system_network/system_network_api.cc
+++ b/extensions/browser/api/system_network/system_network_api.cc
@@ -62,7 +62,7 @@ void SystemNetworkGetNetworkInterfacesFunction::SendResponseOnUIThread(
 
   std::vector<api::system_network::NetworkInterface> create_arg;
   create_arg.reserve(interface_list.size());
-  for (const net::NetworkInterface interface : interface_list) {
+  for (const net::NetworkInterface& interface : interface_list) {
     api::system_network::NetworkInterface info;
     info.name = interface.name;
     info.address = interface.address.ToString();