acme accepts invalid syntax

[Les]

// This works fine
dojo.query('form>');

// This causes a syntax error in Chrome 4, FF 3.5 and Safari 4
document.querySelector('form>');

// This works fine
document.querySelector('form>*');

[Chris Mitchell]

please review/triage

[bill]

Note that the new lite engine will give an error, for example if you run this in the console after loading parser.html:

require(["dojo/query"], function(query){ console.log(query('form>')); })

If acme is loaded though it still gets accepted.