message: remove unused withStyles HOC from DateTimePicker
diff: import React, { Component, Fragment } from 'react';
  import PropTypes from 'prop-types';
  -import { withStyles } from 'material-ui';
  import View from './DateTimePickerView';
  import YearSelection from '../DatePicker/YearSelection';
  @@ -178,8 +177,4 @@ export class DateTimePicker extends Component {
  }
  }
  -const styles = () => ({
  -
  -});
  -
  -export default withStyles(styles)(DateTimePicker);
  +export default DateTimePicker;
  