Bug 1036717 - Test webapp runtime update service. r=myk

--HG--
rename : toolkit/webapps/tests/test_custom_origin.xul => toolkit/webapps/tests/test_hosted_checkforupdates_from_webapp_runtime.xul
rename : toolkit/webapps/tests/test_custom_origin.xul => toolkit/webapps/tests/test_packaged_checkforupdates_from_webapp_runtime.xul