[netstack] Remove obsolete netfilter command

Test: CQ
Change-Id: Ibd99aa15212a4842216ee4924595cf9d8f051d9a
diff --git a/go/src/netstack/BUILD.gn b/go/src/netstack/BUILD.gn
index 075b5e5..6828cd7 100644
--- a/go/src/netstack/BUILD.gn
+++ b/go/src/netstack/BUILD.gn
@@ -35,7 +35,6 @@
 
 package("netstack_tools") {
   deps = [
-    "filter/netfilter",
     "ifconfig",
     "ifinfo",
     "netstat",
@@ -54,10 +53,6 @@
       name = "netstat"
       shell = true
     },
-    {
-      name = "netfilter"
-      shell = true
-    },
   ]
 }
 
diff --git a/go/src/netstack/filter/netfilter/BUILD.gn b/go/src/netstack/filter/netfilter/BUILD.gn
deleted file mode 100644
index 34dbb07..0000000
--- a/go/src/netstack/filter/netfilter/BUILD.gn
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright 2018 The Fuchsia Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import("//build/go/go_binary.gni")
-import("//build/go/go_library.gni")
-import("//build/go/toolchain.gni")
-
-go_binary("netfilter") {
-  gopackage = "netstack/filter/netfilter"
-
-  deps = [
-    ":netfilter_lib",
-  ]
-}
-
-go_library("netfilter_lib") {
-  name = "netfilter"
-
-  deps = [
-    "//garnet/go/src/netstack:netstack_lib",
-  ]
-}
diff --git a/go/src/netstack/filter/netfilter/netfilter.go b/go/src/netstack/filter/netfilter/netfilter.go
deleted file mode 100644
index 998c301..0000000
--- a/go/src/netstack/filter/netfilter/netfilter.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// Copyright 2018 The Fuchsia Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package main
-
-import (
-	"fmt"
-	"os"
-
-	"app/context"
-
-	"fidl/fuchsia/net/filter"
-)
-
-const commandName = "netfilter"
-
-type app struct {
-	ctx    *context.Context
-	filter *filter.FilterInterface
-}
-
-func (a *app) getFilterStatus() {
-	enabled, err := a.filter.IsEnabled()
-	if err != nil {
-		fmt.Println("GetFilterStatus error:", err)
-		return
-	}
-	if enabled {
-		fmt.Println("enabled")
-	} else {
-		fmt.Println("disabled")
-	}
-}
-
-func (a *app) setFilterStatus(enableDisable string) {
-	switch enableDisable {
-	case "enable":
-		a.filter.Enable(true)
-	case "disable":
-		a.filter.Enable(false)
-	default:
-		usage()
-	}
-}
-
-func usage() {
-	fmt.Printf("Usage: %s [enable|disable]\n", commandName)
-	os.Exit(1)
-}
-
-func main() {
-	a := &app{ctx: context.CreateFromStartupInfo()}
-	req, pxy, err := filter.NewFilterInterfaceRequest()
-	if err != nil {
-		panic(err.Error())
-	}
-	a.filter = pxy
-	defer a.filter.Close()
-	a.ctx.ConnectToEnvService(req)
-
-	// TODO: more functions to support here.
-	switch len(os.Args) {
-	case 1:
-		a.getFilterStatus()
-	case 2:
-		a.setFilterStatus(os.Args[1])
-	default:
-		usage()
-	}
-}