Make Hands-Off Zero-Touch Enrollment compatibile with tests

chromeos/network/portal_detector/network_portal_detector.cc

Index: chromeos/network/portal_detector/network_portal_detector.cc
diff --git a/chromeos/network/portal_detector/network_portal_detector.cc b/chromeos/network/portal_detector/network_portal_detector.cc
index 6fcbb3b4eb433a0472c82a1f392de30adcd1c719..02a992e62a39340a1ab1f97464d78ed55f20dbd3 100644
--- a/chromeos/network/portal_detector/network_portal_detector.cc
+++ b/chromeos/network/portal_detector/network_portal_detector.cc
@@ -84,6 +84,10 @@ void SetNetworkPortalDetector(NetworkPortalDetector* network_portal_detector) {
   network_portal_detector_ = network_portal_detector;
 }
 
+void EndTest() {
+  set_for_testing_ = false;
+}
+
 }  // namespace network_portal_detector
 
 }  // namespace chromeos