Fixing a build error

A parameter has been removed, but the next PR merged cleanly while still
using the removed parameter.
diff --git a/test/cpp/end2end/xds_end2end_test.cc b/test/cpp/end2end/xds_end2end_test.cc
index 3792201..7e0b273 100644
--- a/test/cpp/end2end/xds_end2end_test.cc
+++ b/test/cpp/end2end/xds_end2end_test.cc
@@ -3830,7 +3830,7 @@
       {"locality0", GetBackendPorts()},
   });
   balancers_[0]->ads_service()->SetEdsResource(
-      AdsServiceImpl::BuildEdsResource(args), kDefaultResourceName);
+      AdsServiceImpl::BuildEdsResource(args));
   // Wait until all backends are ready.
   int num_ok = 0;
   int num_failure = 0;