Fix autoupdate_EndToEndTest on veyron_rialto

chrome/browser/chromeos/login/mock_network_state_helper.cc

Index: chrome/browser/chromeos/login/mock_network_state_helper.cc
diff --git a/chrome/browser/chromeos/login/mock_network_state_helper.cc b/chrome/browser/chromeos/login/mock_network_state_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0dd622d8dc1b0404fefeb9a10407e444a2085933
--- /dev/null
+++ b/chrome/browser/chromeos/login/mock_network_state_helper.cc
@@ -0,0 +1,14 @@
+// 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 "chrome/browser/chromeos/login/mock_network_state_helper.h"
+
+namespace chromeos {
+namespace login {
+
+MockNetworkStateHelper::MockNetworkStateHelper() {}
+MockNetworkStateHelper::~MockNetworkStateHelper() {}
+
+}  // namespace login
+}  // namespace chromeos