Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/ServiceWorkerGlobalScope/resources/unregister-worker.js

 function matchQuery(query) {
   return self.location.href.indexOf(query) != -1;
 }
 
 if (matchQuery('?evaluation'))
   self.registration.unregister();
 
 self.addEventListener('install', function(e) {
     if (matchQuery('?install'))
       self.registration.unregister();
   });
 
 self.addEventListener('activate', function(e) {
     if (matchQuery('?activate'))
       self.registration.unregister();
   });
 
 self.addEventListener('message', function(e) {
-    e.waitUntil(self.registration.unregister()
+    self.registration.unregister()
       .then(function(result) {
           e.data.port.postMessage({result: result});
-        }));
+        });
   });