Use a service to create device management backends.

chrome/browser/profile.cc

 // 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.
 
 #include "chrome/browser/profile.h"
 
 #include "app/resource_bundle.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 563 matching lines @@
               blob_storage_context_.get(),
               &ChromeBlobStorageContext::InitializeOnIOThread));
     }
     return blob_storage_context_;
   }
 
   virtual ExtensionInfoMap* GetExtensionInfoMap() {
     return profile_->GetExtensionInfoMap();
   }
 
+  virtual policy::DeviceManagementService* GetDeviceManagementService() {
+    return NULL;
+  }
+
   virtual policy::DeviceManagementPolicyProvider*
       GetDeviceManagementPolicyProvider() {
     return NULL;
   }
 
   virtual PromoCounter* GetInstantPromoCounter() {
     return NULL;
   }
 
  private:
@@ skipping 56 matching lines @@
 
   // The file_system context for this profile.
   scoped_refptr<BrowserFileSystemContext> browser_file_system_context_;
 
   DISALLOW_COPY_AND_ASSIGN(OffTheRecordProfileImpl);
 };
 
 Profile* Profile::CreateOffTheRecordProfile() {
   return new OffTheRecordProfileImpl(this);
 }