For cake, combine flour, baking soda and salt in small bowl; mix well. In microwave oven or on top of range over low heat melt chocolate and butter together; stir until chocolate is completely melted. Pour into large bowl. Add oil and sugar; beat with electric mixer until well blended. Beat in eggs, one at time. Combine water, instant coffee and vanilla. Add flour mixture alternately with water mixture, starting and ending with flour. Mix until smooth. Pour into prepared pan.