chat: Use the name of the proxy instead of a specific address.

This allows chat to work with the new RPC system.

Change-Id: I5827ab5174cdf8be99c9856c852fa80a47f73f78
diff --git a/clients/shell/go/src/v.io/x/chat/main.go b/clients/shell/go/src/v.io/x/chat/main.go
index dc74897..9e82341 100644
--- a/clients/shell/go/src/v.io/x/chat/main.go
+++ b/clients/shell/go/src/v.io/x/chat/main.go
@@ -23,7 +23,7 @@
 
 var (
 	mounttable  = flag.String("mounttable", "/ns.dev.v.io:8101", "Mounttable where channel is mounted.")
-	proxy       = flag.String("proxy", "proxy.dev.v.io:8100", "Proxy to listen on.")
+	proxy       = flag.String("proxy", "proxy", "Proxy to listen on.")
 	channelName = flag.String("channel", "users/vanadium.bot@gmail.com/apps/chat/public", "Channel to join.")
 )