[UI Base] overridden remove should trigger event on descendant elements

[scottgonzalez]

Imagine the following code:

<div id="foo">
  <div id="bar"></div>
</div>

$(document).ready(function() {
  $('#bar').draggable();
  $('#foo').remove();
});

The draggable plugin would never know that #foo was removed. See attached patch.

[scott.gonzal]

Fixed in [5174].