Remove leftover references

src/newsreader/js/components/Messages.js

@@ -3,7 +3,9 @@ import React from 'react';
 class Messages extends React.Component {
   state = { messages: this.props.messages };
 
-  close = (index) => {
+  close = ::this.close;
+
+  close(index) {
     const newMessages = this.state.messages.filter((message, currentIndex) => {
       return currentIndex != index;
     });

src/newsreader/js/pages/homepage/components/PostModal.js

@@ -7,6 +7,7 @@ import { SAVED_TYPE } from '../constants.js';
 import { formatDatetime } from '../../../utils.js';
 
 class PostModal extends React.Component {
+  modalListener = ::this.modalListener;
 readTimer = null;
 
 componentDidMount() {
@@ -31,7 +32,7 @@ class PostModal extends React.Component {
   window.removeEventListener('click', this.modalListener);
 }
 
-  modalListener = (e) => {
+modalListener(e) {
   const targetClassName = e.target.className;
 
   if (this.props.post && targetClassName == 'modal post-modal') {