[giow] (1) Fire 'input' events on <select> also.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23449
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@8368 340c8d12-0b0e-0410-8428-c7bf67bfef74