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

chrome/browser/policy/browser_policy_connector.cc

 // Copyright (c) 2012 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/policy/browser_policy_connector.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
@@ skipping 168 matching lines @@
   } else {
     providers.push_back(&user_cloud_policy_provider_);
   }
 
   return new PolicyServiceImpl(providers);
 }
 
 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);
   }
 #endif
 }
 
 bool BrowserPolicyConnector::IsEnterpriseManaged() {
 #if defined(OS_CHROMEOS)
   return install_attributes_.get() && install_attributes_->IsEnterpriseDevice();
 #else
@@ skipping 363 matching lines @@
     return new AsyncPolicyProvider(loader.Pass());
   } else {
     return NULL;
   }
 #else
   return NULL;
 #endif
 }
 
 }  // namespace policy