Updating <object> upon changing "data", "classid", "type" attributes.

If an HTMLObjectElement's "type", "data", or "classid" attributes are
dynamically modified, trigger a refresh of the element. Following the
rules given in

  http://www.whatwg.org/specs/web-apps/current-work/#dom-object-data

(cf. "Whenever one of the following conditions occur:")

R=abarth,eseidel,esprehn
BUG=123536
TEST=fast/dom/HTMLObjectElement/update-data

Review URL: https://codereview.chromium.org/135103003

git-svn-id: svn://svn.chromium.org/blink/trunk@165298 bbb929c8-8fbe-4397-9dbb-9b2b20218538