When install default apps on the Mac, don't need to do extra checking

BUG=101964
TEST=When doing a user install (not system install) of chrome on a mac, make
sure that the default apps are correctly installed into new profiles.

Review URL: http://codereview.chromium.org/8400047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107734 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/external_extension_provider_impl.cc

@@ -355,7 +355,8 @@ void ExternalExtensionProviderImpl::CreateExternalProviders(
             new ExternalExtensionProviderImpl(
                 service,
                 new ExternalPrefExtensionLoader(
-                    chrome::DIR_DEFAULT_APPS, options),
+                    chrome::DIR_DEFAULT_APPS,
+                    ExternalPrefExtensionLoader::NONE),
                 Extension::EXTERNAL_PREF,
                 Extension::INVALID,
                 Extension::FROM_BOOKMARK)));