[ServiceWorker] Update formatting for tests.

LayoutTests/http/tests/serviceworker/resources/fetch-request-resources-worker.js

 var requests = [];
 var port = undefined;
 
 self.onmessage = function(e) {
   var message = e.data;
   if ('port' in message) {
     port = message.port;
     port.postMessage({ready: true});
   }
 };
 
 self.addEventListener('fetch', function(event) {
     var url = event.request.url;
     if (url.indexOf('dummy?test') == -1) {
       return;
     }
     port.postMessage({
-      url: url,
-      mode: event.request.mode,
-      credentials: event.request.credentials,
-    });
+        url: url,
+        mode: event.request.mode,
+        credentials: event.request.credentials
+      });
     event.respondWith(Promise.reject());
   });