Fix cros build.

Review URL: http://codereview.chromium.org/7988003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102275 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/external_extension_provider_impl.cc

@@ -262,7 +262,8 @@ void ExternalExtensionProviderImpl::CreateExternalProviders(
           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