Revert of Make Hands-Off Zero-Touch Enrollment compatibile with tests

chromeos/network/portal_detector/mock_network_portal_detector.cc

Index: chromeos/network/portal_detector/mock_network_portal_detector.cc
diff --git a/chromeos/network/portal_detector/mock_network_portal_detector.cc b/chromeos/network/portal_detector/mock_network_portal_detector.cc
deleted file mode 100644
index e507980293c77878f1b5769cb8af3250092faf51..0000000000000000000000000000000000000000
--- a/chromeos/network/portal_detector/mock_network_portal_detector.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2017 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 "chromeos/network/portal_detector/mock_network_portal_detector.h"
-
-namespace chromeos {
-
-MockNetworkPortalDetector::MockNetworkPortalDetector() {}
-
-MockNetworkPortalDetector::~MockNetworkPortalDetector() {}
-
-}  // namespace chromeos