fix typo in _syncEvent; make it possible for a component to entirely change the class of its rendering's component
fix typo in _syncEvent; make it possible for a component to entirely change the class of its rendering's component

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/986463003

collinjackson/mojo,jianglu/mojo,collinjackson/mojo,collinjackson/mojo,chinmaygarde/mojo,afandria/mojo,chinmaygarde/mojo,jianglu/mojo,chinmaygarde/mojo,jianglu/mojo,chinmaygarde/mojo,jianglu/mojo,afandria/mojo,afandria/mojo,collinjackson/mojo,chinmaygarde/mojo,jianglu/mojo,collinjackson/mojo,collinjackson/mojo,chinmaygarde/mojo,afandria/mojo,jianglu/mojo,jianglu/mojo,chinmaygarde/mojo,chinmaygarde/mojo,chinmaygarde/mojo,collinjackson/mojo,afandria/mojo,collinjackson/mojo,jianglu/mojo,afandria/mojo,collinjackson/mojo,afandria/mojo,afandria/mojo