[ServiceWorker] Use the cookie which is differnt from the username in LayoutTest.

LayoutTests/http/tests/serviceworker/resources/test-helpers.js

 // Adapter for testharness.js-style tests with Service Workers
 
 function service_worker_unregister_and_register(test, url, scope) {
   if (!scope || scope.length == 0)
     return Promise.reject(new Error('tests must define a scope'));
 
   var options = { scope: scope };
   return service_worker_unregister(test, scope)
     .then(function() {
         return navigator.serviceWorker.register(url, options);
@@ skipping 229 matching lines @@
     HTTP_REMOTE_ORIGIN: 'http://' + REMOTE_HOST + ':' + HTTP_PORT,
     HTTPS_REMOTE_ORIGIN: 'https://' + REMOTE_HOST + ':' + HTTPS_PORT,
     UNAUTHENTICATED_ORIGIN: 'http://' + UNAUTHENTICATED_HOST + ':' + HTTP_PORT
   };
 }
 
 function base_path() {
   return location.pathname.replace(/\/[^\/]*$/, '/');
 }
 
-function test_login(test, origin, username, password) {
+function test_login(test, origin, username, password, cookie) {
   return new Promise(function(resolve, reject) {
       with_iframe(
         origin + base_path() +
         'resources/fetch-access-control-login.html')
         .then(test.step_func(function(frame) {
             var channel = new MessageChannel();
             channel.port1.onmessage = test.step_func(function() {
                 unload_iframe(frame).catch(function() {});
                 resolve();
               });
             frame.contentWindow.postMessage(
-              {username: username, password: password},
+              {username: username, password: password, cookie: cookie},
               [channel.port2], origin);
           }));
     });
 }