Fixing eslint errors

web/react/components/signup_user_complete.jsx

@@ -5,7 +5,6 @@ var utils = require('../utils/utils.jsx');
 var client = require('../utils/client.jsx');
 var UserStore = require('../stores/user_store.jsx');
 var BrowserStore = require('../stores/browser_store.jsx');
-var Constants = require('../utils/constants.jsx');
 
 export default class SignupUserComplete extends React.Component {
     constructor(props) {