Combine chicken broth, 1 cup water, 1/3 cup rice wine, and the ginger in large saucepan. Heat to boiling. Reduce heat and simmer uncovered 20 minutes.
Remove ginger from broth and stir in remaining 3 T. rice wine, the corn and salt. Heat to boiling, then reduce heat to low.
Dissolve cornstarch in remaining 1/4 cup water and gradually stir into soup. Heat, stirring constantly, until slightly thickened. Remove from heat and pour egg whites in thin stream around edge. Stir once and add sesame oil.