TF-3157 Update web socket with background service worker

TF-3157 Stub BroadcastChannel for mobile build

web/worker_service/worker_service.js

@@ -4,7 +4,6 @@ const iosPlatform = 'iOS';
 const androidPlatform = 'android';
 const otherPlatform = 'other';
 const timeoutDuration = 4000;
-var serviceWorkerVersion = null;
 var scriptLoaded = false;
 
 function loadMainDartJs() {
@@ -24,16 +23,7 @@ function fetchServiceWorker() {
     // Wait for registration to finish before dropping the <script>tag.
     // Otherwise, the browser will load the script multiple times,
     // potentially different versions.
-    navigator.serviceWorker.register('firebase-messaging-sw.js').then(serviceWorkerRegistration => {
-      console.info('[TwakeMail] fetchServiceWorker(): Service worker firebase-messaging was registered.');
-    }).catch(error => {
-      console.error(
-        '[TwakeMail] fetchServiceWorker(): An error occurred while registering the service worker firebase-messaging.'
-        );
-      console.error(error);
-    });
-    var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
-    navigator.serviceWorker.register(serviceWorkerUrl)
+    navigator.serviceWorker.register('web-sockets-worker.js')
       .then((reg) => {
         function waitForActivation(serviceWorker) {
           serviceWorker.addEventListener('statechange', () => {
@@ -47,12 +37,6 @@ function fetchServiceWorker() {
           // No active web worker and we have installed or are installing
           // one for the first time. Simply wait for it to activate.
           waitForActivation(reg.installing || reg.waiting);
-        } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
-          // When the app updates the serviceWorkerVersion changes, so we
-          // need to ask the service worker to update.
-          console.log('[TwakeMail] fetchServiceWorker(): New service worker available.');
-          reg.update();
-          waitForActivation(reg.installing);
         } else {
           // Existing service worker is still good.
           console.log('[TwakeMail] fetchServiceWorker(): Loading app from service worker.');