If there is a device id use that instead of a new one for re-enrolling.

chrome/browser/policy/browser_policy_connector.cc

Index: chrome/browser/policy/browser_policy_connector.cc
diff --git a/chrome/browser/policy/browser_policy_connector.cc b/chrome/browser/policy/browser_policy_connector.cc
index 080c5c9afd050be75f371e9207bf2e287d8e862a..fa92c1ae67cb41b76a351a04cfc08d1c84e9caf8 100644
--- a/chrome/browser/policy/browser_policy_connector.cc
+++ b/chrome/browser/policy/browser_policy_connector.cc
@@ -186,15 +186,21 @@ PolicyService* BrowserPolicyConnector::CreatePolicyService(
 void BrowserPolicyConnector::RegisterForDevicePolicy(
     const std::string& owner_email,
     const std::string& token,
-    bool known_machine_id) {
+    bool known_machine_id,
+    bool reregister) {
 #if defined(OS_CHROMEOS)
   if (device_data_store_.get()) {
     if (!device_data_store_->device_token().empty()) {
       LOG(ERROR) << "Device policy data store already has a DMToken; "
                  << "RegisterForDevicePolicy won't trigger a new registration.";
     }
+
     device_data_store_->set_user_name(owner_email);
     device_data_store_->set_known_machine_id(known_machine_id);
+    if (reregister) {
+      device_data_store_->set_device_id(install_attributes_->GetDeviceId());
+      device_data_store_->set_reregister(true);
+    }
     device_data_store_->set_policy_fetching_enabled(false);
     device_data_store_->SetOAuthToken(token);
   }