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This is needed for cases where the UINode doesn't have a list of children (so it doesn't go through the RenderNodeWrapper sync logic that removes children), but it still has multiple slots, and needs to support removing nodes from those slots. (For example, removing a drawer from a ScaffoldContainer.) Also, expose syncChild (it used to be private) so it can be overridden in descendants outside fn.dart. R=abarth@chromium.org Review URL: https://codereview.chromium.org/1158563003