Upstream service worker `fetch` tests to WPT

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-response-xhr.https.html

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-response-xhr.https.html
diff --git a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-response-xhr.https.html b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-response-xhr.https.html
index 24eb44e222ece562c5e34fe238e4e71c10f10b0d..74173e8b9bdcc77c5f85832f85a5c44856b78565 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-response-xhr.https.html
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-response-xhr.https.html
@@ -3,7 +3,7 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <script src="/common/get-host-info.sub.js"></script>
-<script src="resources/test-helpers.sub.js?pipe=sub"></script>
+<script src="resources/test-helpers.sub.js"></script>
 <script>
 async_test(function(t) {
     var SCOPE = 'resources/fetch-response-xhr-iframe.https.html';
@@ -13,7 +13,7 @@ async_test(function(t) {
     window.addEventListener('message', t.step_func(on_message), false);
     function on_message(e) {
       assert_equals(e.data.results, 'foo, bar');
-      t.done();
+      e.source.postMessage('ACK', host_info['HTTPS_ORIGIN']);
     }
 
     service_worker_unregister_and_register(t, SCRIPT, SCOPE)
@@ -22,13 +22,19 @@ async_test(function(t) {
         })
       .then(function() { return with_iframe(SCOPE); })
       .then(function(frame) {
-          var channel = new MessageChannel();
-          channel.port1.onmessage = t.step_func(function(e) {
-              assert_equals(e.data.results, 'finish');
+          var channel;
+
+          t.add_cleanup(function() {
               frame.remove();
               service_worker_unregister_and_done(t, SCOPE);
             });
-          frame.contentWindow.postMessage({},
+
+          channel = new MessageChannel();
+          channel.port1.onmessage = t.step_func(function(e) {
+              assert_equals(e.data.results, 'finish');
+              t.done();
+            });
+          frame.contentWindow.postMessage('START',
                                           host_info['HTTPS_ORIGIN'],
                                           [channel.port2]);
         })