[giow] (3) Revert the regression in the definition of 'entry script' from r8114
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=22862
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@8123 340c8d12-0b0e-0410-8428-c7bf67bfef74