Correct ref used in get_dom_node_test example
Correct ref used in get_dom_node_test example

cleandart/react-dart,evanweible-wf/react-dart,cleandart/react-dart,evanweible-wf/react-dart,evanweible-wf/react-dart,evanweible-wf/react-dart,cleandart/react-dart,cleandart/react-dart