remove unused code

Author: mar-hai

includes/troubleshooting/flutter/enable_multi_view.mdx

@@ -195,17 +195,6 @@ _flutter.loader.load({
       <div id="left" style="width: 50%; height: 100%; float: left;"></div>
       <div id="right" style="width: 50%; height: 100%; float: left;"></div>
     </div>
-    <!-- This script installs service_worker.js to provide PWA functionality to
-       application. For more information, see:
-       https://developers.google.com/web/fundamentals/primers/service-workers -->
-    <script>
-      if ("serviceWorker" in navigator) {
-        window.addEventListener("load", function () {
-          navigator.serviceWorker.register("flutter_service_worker.js");
-        });
-      }
-    </script>
-    <script src="main.dart.js" type="application/javascript"></script>
     <script
       src="flutter_bootstrap.js"
       type="application/javascript"