TBR: syncbase - fix compilation of echo_server.go

Change-Id: I8e3462e3e9a8ad53a958137aa4cadb76a14dcc1d
diff --git a/go/src/echo_server.go b/go/src/echo_server.go
index 29323c5..f07e438 100644
--- a/go/src/echo_server.go
+++ b/go/src/echo_server.go
@@ -10,8 +10,6 @@
 import (
 	"log"
 
-	"golang.org/x/mobile/app"
-
 	"mojo/public/go/application"
 	"mojo/public/go/bindings"
 	"mojo/public/go/system"
@@ -68,6 +66,4 @@
 	return C.MOJO_RESULT_OK
 }
 
-func main() {
-	app.Run(app.Callbacks{})
-}
+func main() {}