Fix cros build.

chrome/browser/extensions/external_extension_provider_impl.cc

 // Copyright (c) 2011 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/extensions/external_extension_provider_impl.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/path_service.h"
@@ skipping 244 matching lines @@
               Extension::EXTERNAL_PREF_DOWNLOAD)));
 #endif
 
 #if defined(OS_CHROMEOS)
   // Chrome OS specific source for OEM customization.
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalPrefExtensionLoader(
-                  chrome::DIR_USER_EXTERNAL_EXTENSIONS),
+                  chrome::DIR_USER_EXTERNAL_EXTENSIONS,
+                  ExternalPrefExtensionLoader::NONE),
               Extension::EXTERNAL_PREF,
               Extension::EXTERNAL_PREF_DOWNLOAD)));
 #endif
 #if defined(OS_WIN)
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalRegistryExtensionLoader,
               Extension::EXTERNAL_REGISTRY,
               Extension::INVALID)));
 #endif
   provider_list->push_back(
       linked_ptr<ExternalExtensionProviderInterface>(
           new ExternalExtensionProviderImpl(
               service,
               new ExternalPolicyExtensionLoader(profile),
               Extension::INVALID,
               Extension::EXTERNAL_POLICY_DOWNLOAD)));
 }