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

chromecast/net/net_util_cast.h

Index: chromecast/net/net_util_cast.h
diff --git a/chromecast/net/net_util_cast.h b/chromecast/net/net_util_cast.h
deleted file mode 100644
index 2ec95bbd985a7b15ab6da890c2ccd8ddbfa9a48f..0000000000000000000000000000000000000000
--- a/chromecast/net/net_util_cast.h
+++ /dev/null
@@ -1,20 +0,0 @@
-// 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.
-
-#ifndef CHROMECAST_NET_NET_UTIL_H_
-#define CHROMECAST_NET_NET_UTIL_H_
-
-#include <string>
-
-#include "base/containers/hash_tables.h"
-
-namespace chromecast {
-
-// Gets the list of interfaces that should be ignored. The interfaces returned
-// by this function will not be used to connect to the internet.
-base::hash_set<std::string> GetIgnoredInterfaces();
-
-}  // namespace chromecast
-
-#endif  // CHROMECAST_NET_NET_UTIL_CAST_H_