Only test IDN nodes against kMaxDNSNodeLen on string-prepped IDNs that we're going to send to DNS, not the Unicode form for display only. Bug 892370, r=honzab

--HG--
rename : netwerk/test/unit/test_bug722299.js => netwerk/test/unit/test_idn_urls.js
Bug 860490 - Mark _pluginthreadasynccall calls as safe to re-enter gecko. r=bsmedberg,roc