chat: Update vdl for 2 pass gen

MultiPart: 6/9
Change-Id: I00ca8eb031ea5a0cfe3fb7d5b12dc16cd1cdc943
diff --git a/clients/shell/go/src/v.io/x/chat/vdl/chat.vdl.go b/clients/shell/go/src/v.io/x/chat/vdl/chat.vdl.go
index 2184cec..123a61e 100644
--- a/clients/shell/go/src/v.io/x/chat/vdl/chat.vdl.go
+++ b/clients/shell/go/src/v.io/x/chat/vdl/chat.vdl.go
@@ -8,7 +8,6 @@
 package vdl
 
 import (
-	// VDL system imports
 	"v.io/v23"
 	"v.io/v23/context"
 	"v.io/v23/rpc"