ref(chat): removed unused getChatInputRef callback for input

react/features/chat/components/web/ChatInput.js

      */
     dispatch: Dispatch<any>,
 
-    /**
-     * Optional callback to get a reference to the chat input element.
-     */
-    getChatInputRef?: Function,
-
     /**
      * Invoked to obtain translated strings.
      */
      */
     _setTextAreaRef(textAreaElement: ?HTMLTextAreaElement) {
         this._textArea = textAreaElement;
-
-        if (this.props.getChatInputRef) {
-            this.props.getChatInputRef(textAreaElement);
-        }
     }
 }