Add DeviceADPolicyManager to provide AD policy.

chrome/browser/policy/cloud/policy_header_service_factory.cc

 // Copyright 2013 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/cloud/policy_header_service_factory.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
@@ skipping 87 matching lines @@
            Profile::FromBrowserContext(context));
 #else
   CloudPolicyManager* manager =
       UserCloudPolicyManagerFactory::GetForBrowserContext(context);
 #endif
   if (!manager)
     return NULL;
   CloudPolicyStore* user_store = manager->core()->store();
   CloudPolicyStore* device_store = NULL;
 #if defined(OS_CHROMEOS)
+  // TODO(tnagel): Add support for Active Directory management.
+  if (!connector->GetDeviceCloudPolicyManager())
+    return NULL;
   device_store = connector->GetDeviceCloudPolicyManager()->core()->store();
 #endif
 
   std::unique_ptr<PolicyHeaderService> service =
       base::MakeUnique<PolicyHeaderService>(
           device_management_service->GetServerUrl(), kPolicyVerificationKeyHash,
           user_store, device_store);
   return new PolicyHeaderServiceWrapper(std::move(service));
 }
 
 // static
 PolicyHeaderServiceFactory* PolicyHeaderServiceFactory::GetInstance() {
   return base::Singleton<PolicyHeaderServiceFactory>::get();
 }
 
 }  // namespace policy