[e] (0) Switch to using USVString where that makes the prose simpler. (WebSocket, primarily)
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=26967
Affected topics: DOM APIs

git-svn-id: https://svn.whatwg.org/webapps@8836 340c8d12-0b0e-0410-8428-c7bf67bfef74
Merge remote branch 'origin/master' into whatwg