chat: Update makefile to use new proxy.

Change-Id: I25cea2382be1e8a210567eb63bdf53ddc25d9484
diff --git a/Makefile b/Makefile
index 6cb32b8..cf1c04e 100644
--- a/Makefile
+++ b/Makefile
@@ -107,7 +107,7 @@
 	$(GO) install -a -tags wspr v.io/x/ref/cmd/servicerunner
 	$(GO) install \
 	v.io/x/ref/services/mounttable/mounttabled \
-	v.io/x/ref/services/proxy/proxyd \
+	v.io/x/ref/services/xproxy/xproxyd \
 	v.io/x/ref/cmd/{principal,vdl} \
 	v.io/x/ref/services/agent/agentd