function getTargetInstForInputEvent(topLevelType, targetInst) {
	  if (topLevelType === 'topInput') {
	    // In modern browsers (i.e., not IE8 or IE9), the input event is exactly
	    // what we want so fall through here and trigger an abstract event
	    return targetInst;
	  }
	}
If a `change` event should be fired, returns the target's ID.