[giow] (2) Try to match browsers better around focus.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=26826
Affected topics: DOM APIs, HTML

git-svn-id: https://svn.whatwg.org/webapps@8810 340c8d12-0b0e-0410-8428-c7bf67bfef74
[giow] (3) Add getSVGDocument() to object and iframe also, with the same definition as for embed.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=25940

git-svn-id: https://svn.whatwg.org/webapps@8811 340c8d12-0b0e-0410-8428-c7bf67bfef74
Merge remote branch 'origin/master' into whatwg