[e] (0) Remove the text made redundant by [Exposed]
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=24518
Affected topics: DOM APIs, Workers

git-svn-id: http://svn.whatwg.org/webapps@8467 340c8d12-0b0e-0410-8428-c7bf67bfef74