[giow] (3) Move the event handler content attribute compiling logic to later in the pipeline, for better consistency with Firefox/Safari (and other browsers, though to a lesser extent).
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23836
Affected topics: DOM APIs

git-svn-id: http://svn.whatwg.org/webapps@8303 340c8d12-0b0e-0410-8428-c7bf67bfef74