Add DeviceADPolicyManager to provide AD policy.

chrome/browser/chromeos/policy/device_cloud_policy_store_chromeos.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_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_STORE_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_STORE_CHROMEOS_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 12 matching lines @@
 class InstallAttributes;
 }
 
 namespace enterprise_management {
 class PolicyFetchResponse;
 }
 
 namespace policy {
 
 // CloudPolicyStore implementation for device policy on Chrome OS. Policy is
-// stored/loaded via D-Bus to/from session_manager.
+// stored/loaded via DBus to/from session_manager.
 class DeviceCloudPolicyStoreChromeOS
     : public CloudPolicyStore,
       public chromeos::DeviceSettingsService::Observer {
  public:
   DeviceCloudPolicyStoreChromeOS(
       chromeos::DeviceSettingsService* device_settings_service,
       chromeos::InstallAttributes* install_attributes,
       scoped_refptr<base::SequencedTaskRunner> background_task_runner);
   ~DeviceCloudPolicyStoreChromeOS() override;
 
@@ skipping 46 matching lines @@
   scoped_refptr<base::SequencedTaskRunner> background_task_runner_;
 
   base::WeakPtrFactory<DeviceCloudPolicyStoreChromeOS> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCloudPolicyStoreChromeOS);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_STORE_CHROMEOS_H_