[uievents] CustomEvent.initCustomEvent() is in DOM (#45)

Copied from W3C Bugzilla: https://www.w3.org/Bugs/Public/show_bug.cgi?id=28734

##### Philip Jägenstedt 2015-06-01 21:43:18 UTC
https://dom.spec.whatwg.org/#interface-customevent

In other words, it need not be defined again by UI Events.


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https://github.com/w3c/uievents/issues/45