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

chrome/browser/policy/cloud_policy_data_store.h

 // 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.
 
 #ifndef CHROME_BROWSER_POLICY_CLOUD_POLICY_DATA_STORE_H_
 #define CHROME_BROWSER_POLICY_CLOUD_POLICY_DATA_STORE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 60 matching lines @@
                        bool token_cache_loaded);
 
   void set_device_id(const std::string& device_id);
   void set_machine_id(const std::string& machine_id);
   void set_machine_model(const std::string& machine_model);
   void set_user_name(const std::string& user_name);
   void set_user_affiliation(UserAffiliation user_affiliation);
   void set_known_machine_id(bool known_machine_id);
   void set_policy_fetching_enabled(bool policy_fetching_enabled);
   void set_device_mode(DeviceMode device_mode);
+  void set_reregister(bool reregister);
 
 #if defined(OS_CHROMEOS)
   void set_device_status_collector(DeviceStatusCollector* collector);
   DeviceStatusCollector* device_status_collector();
 #endif
 
   const std::string& device_id() const;
   const std::string& device_token() const;
   const std::string& gaia_token() const;
   const std::string& oauth_token() const;
   bool has_auth_token() const;
   const std::string& machine_id() const;
   const std::string& machine_model() const;
   enterprise_management::DeviceRegisterRequest_Type
       policy_register_type() const;
   const std::string& policy_type() const;
   bool token_cache_loaded() const;
   bool policy_fetching_enabled() const;
   const std::string& user_name() const;
   UserAffiliation user_affiliation() const;
   bool known_machine_id() const;
   DeviceMode device_mode() const;
+  bool reregister() const;
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   void NotifyCredentialsChanged();
   void NotifyDeviceTokenChanged();
 
  private:
   CloudPolicyDataStore(
       const enterprise_management::DeviceRegisterRequest_Type register_type,
@@ skipping 11 matching lines @@
   // Constants that won't change over the life-time of a cloud policy
   // subsystem.
   const enterprise_management::DeviceRegisterRequest_Type policy_register_type_;
   const std::string policy_type_;
 
   // Data used for constructiong both register and policy requests.
   std::string device_id_;
   std::string machine_model_;
   std::string machine_id_;
   bool known_machine_id_;
+  bool reregister_;
 
   bool token_cache_loaded_;
   bool policy_fetching_enabled_;
 
   DeviceMode device_mode_;
 
 #if defined(OS_CHROMEOS)
   scoped_ptr<DeviceStatusCollector> device_status_collector_;
 #endif
 
   ObserverList<Observer, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPolicyDataStore);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_CLOUD_POLICY_DATA_STORE_H_