Renamed HTMLIframeElementTypeId to HTMLIFrameElementTypeId
Implement "resize" DOM Event.

* We cannot automate this feature.
* So this testcase is a manual test.
auto merge of #1783 : saneyuki/servo/resize, r=jdm

#1715
auto merge of #1781 : hgentry/servo/mozilla-servo, r=metajack

Simple change. I hope I'm using github correctly; I'm not too familiar with the PR system. Fixes #1777.
De-@mut the script crate.