Revert of [Chromecast] Ignore interfaces not used to connect to internet.

chromecast/net/network_change_notifier_factory_cast.cc

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chromecast/net/network_change_notifier_factory_cast.h"
-
-#include "chromecast/net/net_util_cast.h"
-#include "net/base/network_change_notifier_linux.h"
-
-namespace chromecast {
-
-net::NetworkChangeNotifier* NetworkChangeNotifierFactoryCast::CreateInstance() {
-  // Caller assumes ownership.
-  return new net::NetworkChangeNotifierLinux(GetIgnoredInterfaces());
-}
-
-NetworkChangeNotifierFactoryCast::~NetworkChangeNotifierFactoryCast() {
-}
-
-}  // namespace chromecast