Change to arrow function

bigbluebutton-html5/imports/ui/components/chat/message-form/component.jsx

@@ -47,6 +47,8 @@ class MessageForm extends Component {
   }
 
   handleMessageKeyDown(e) {
+
+    //TODO Prevent send message pressing enter on mobile and/or virtual keyboard    
     if (e.keyCode === 13 && !e.shiftKey) {
       e.preventDefault();
 
@@ -125,7 +127,7 @@ class MessageForm extends Component {
           label={intl.formatMessage(messages.submitLabel)}
           hideLabel={true}
           icon={"right_arrow"}
-          onClick={function(){}}
+          onClick={()=>{}}
           />
       </form>
     );