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

chrome/browser/policy/device_token_fetcher.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/device_token_fetcher.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
@@ skipping 160 matching lines @@
   request_job_->SetClientID(data_store_->device_id());
   em::DeviceRegisterRequest* request =
       request_job_->GetRequest()->mutable_register_request();
   request->set_type(data_store_->policy_register_type());
   if (!data_store_->machine_id().empty())
     request->set_machine_id(data_store_->machine_id());
   if (!data_store_->machine_model().empty())
     request->set_machine_model(data_store_->machine_model());
   if (data_store_->known_machine_id())
     request->set_auto_enrolled(true);
+  if (data_store_->reregister())
+    request->set_reregister(true);
   request_job_->Start(base::Bind(&DeviceTokenFetcher::OnTokenFetchCompleted,
                                  base::Unretained(this)));
   UMA_HISTOGRAM_ENUMERATION(kMetricToken, kMetricTokenFetchRequested,
                             kMetricTokenSize);
 }
 
 void DeviceTokenFetcher::OnTokenFetchCompleted(
     DeviceManagementStatus status,
     const em::DeviceManagementResponse& response) {
   if (status == DM_STATUS_SUCCESS && !response.has_register_response()) {
     // Handled below.
     status = DM_STATUS_RESPONSE_DECODING_ERROR;
   }
 
+  LOG_IF(ERROR, status != DM_STATUS_SUCCESS) << "DMServer returned error code: "
+                                             << status;
   SampleErrorStatus(status);
 
   switch (status) {
     case DM_STATUS_SUCCESS: {
       const em::DeviceRegisterResponse& register_response =
           response.register_response();
       if (register_response.has_device_management_token()) {
         UMA_HISTOGRAM_ENUMERATION(kMetricToken, kMetricTokenFetchOK,
                                   kMetricTokenSize);
 
@@ skipping 142 matching lines @@
     case STATE_UNMANAGED:
     case STATE_ERROR:
     case STATE_TEMPORARY_ERROR:
     case STATE_BAD_AUTH:
       FetchTokenInternal();
       break;
   }
 }
 
 }  // namespace policy