Rework the device management backend implementation.

chrome/browser/policy/device_management_policy_provider.h

 // Copyright (c) 2010 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_DEVICE_MANAGEMENT_POLICY_PROVIDER_H_
 #define CHROME_BROWSER_POLICY_DEVICE_MANAGEMENT_POLICY_PROVIDER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 52 matching lines @@
   // specified in |storage_dir| is used to store the device token and persisted
   // policy, rather than the user's data directory.
   DeviceManagementPolicyProvider(
       const PolicyDefinitionList* policy_list,
       DeviceManagementBackend* backend,
       const FilePath& storage_dir);
 
  private:
   class InitializeAfterIOThreadExistsTask;
 
-  // Returns the device management backend to use for backend requests, lazily
-  // creating a new one if one doesn't already exist.
-  DeviceManagementBackend* GetBackend();
-
   // Called by constructors to perform shared initialization. Initialization
   // requiring the IOThread must not be performed directly in this method,
   // rather must be deferred until the IOThread is fully initialized. This is
   // the case in InitializeAfterIOThreadExists.
   void Initialize();
 
   // Called by a deferred task posted to the UI thread to complete the portion
   // of initialization that requires the IOThread.
   void InitializeAfterIOThreadExists();
 
@@ skipping 20 matching lines @@
   NotificationRegistrar registrar_;
   FilePath storage_dir_;
   bool policy_request_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceManagementPolicyProvider);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_DEVICE_MANAGEMENT_POLICY_PROVIDER_H_