Remove an extra allocation for open source bundles #11797
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EventListener normalizes event subscription for <= IE8. This is no longer necessary. element.addEventListener is sufficient.
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This is an alternative to #11617 that doesn't break our internal www override of EventListener. The benefit is it gets rid of the
{ remove: function() {} }allocation in open source (which we don't use) but still routes React listeners through our www fork which is integrated with TimeSlice. This uses the new forking mechanism.