MessagePort: implement disentanglement (#36654)

Implement
[disentangle](https://html.spec.whatwg.org/multipage/#disentangle)
Remove bespoke gc logic which now becomes unnecessary. 
Adds a wpt test that hits the "disentangle while in transfer" logic.
Updates streams code, fixing an error where disentanglement is
conditional on an error.

Test coverage: there are existing tests in
`/webmessaging/message-channels/close-event/explicitly-closed.tentative.window.js`
for the no transfer case, and the simple completed transfer case, and
this PR adds a test for the more complicated transfer in progress case.

Fix https://github.com/servo/servo/issues/36465

---------

Signed-off-by: gterzian <2792687+gterzian@users.noreply.github.com>

tests/wpt/meta/MANIFEST.json

@@ -518802,7 +518802,7 @@
      "close-event": {
       "resources": {
        "helper.js": [
-        "cb9ea9fe981e95374b836255c752a42de788fc7b",
+        "48744ac1c5b530ef8d46c3d9a0378c698353a5bc",
         []
        ]
       }
@@ -848537,7 +848537,7 @@
        ]
       ],
       "explicitly-closed.tentative.window.js": [
-       "612003d58eaea908ad93294a7bbf777184356a28",
+       "12bfa0bd73e9278e39b825d4fa81437f943cbd02",
        [
         "webmessaging/message-channels/close-event/explicitly-closed.tentative.window.html",
         {

tests/wpt/meta/html/dom/idlharness.any.js.ini

@@ -95,9 +95,6 @@
   [History interface: existence and properties of interface object]
     expected: FAIL
 
-  [MessagePort interface: attribute onclose]
-    expected: FAIL
-
   [WorkerGlobalScope interface: attribute onlanguagechange]
     expected: FAIL
 

tests/wpt/meta/html/dom/idlharness.https.html.ini

@@ -1517,9 +1517,6 @@
   [SVGSVGElement interface: attribute onpagereveal]
     expected: FAIL
 
-  [MessagePort interface: attribute onclose]
-    expected: FAIL
-
   [NotRestoredReasonDetails interface: existence and properties of interface object]
     expected: FAIL
 
@@ -5363,9 +5360,6 @@
   [Navigator interface: window.navigator must inherit property "pdfViewerEnabled" with the proper type]
     expected: FAIL
 
-  [MessagePort interface: attribute onclose]
-    expected: FAIL
-
   [SharedWorker interface: existence and properties of interface object]
     expected: FAIL
 

tests/wpt/meta/webmessaging/message-channels/close-event/explicitly-closed.tentative.window.js.ini

@@ -1,7 +0,0 @@
-[explicitly-closed.tentative.window.html]
-  expected: TIMEOUT
-  [Close event on port2 is fired when port1 is explicitly closed]
-    expected: TIMEOUT
-
-  [Close event on port2 is fired when port1, which is in a different window, is explicitly closed.]
-    expected: TIMEOUT

tests/wpt/tests/webmessaging/message-channels/close-event/explicitly-closed.tentative.window.js

@@ -33,3 +33,13 @@ promise_test(async t => {
   });
   await closeEventPromise;
 }, 'Close event on port2 is fired when port1, which is in a different window, is explicitly closed.')
+
+promise_test(async t => {
+  const rc = await addWindow();
+  const waitForPort = expectMessagePortFromWindowWithoutStartingIt(window);
+  await createMessageChannelAndSendPortFollowedByClose(rc);
+  const port = await waitForPort;
+  const closeEventPromise = createCloseEventPromise(port);
+  port.start();
+  await closeEventPromise;
+}, 'Close event on port2 is fired when port1, in a different window, is closed during the transfer of port2.')

tests/wpt/tests/webmessaging/message-channels/close-event/resources/helper.js

@@ -21,6 +21,44 @@ function expectMessagePortFromWindow(window) {
   });
 }
 
+/**
+ * Create a new promise that resolves when the window receives
+ * the MessagePort and does not start it.
+ *
+ * @param {Window} window - The window to wait for the MessagePort.
+ * @returns {Promise<MessagePort>} A promise you should await to ensure the
+ *     window
+ * receives the MessagePort.
+ */
+function expectMessagePortFromWindowWithoutStartingIt(window) {
+  return new Promise(resolve => {
+    window.onmessage = e => {
+      try {
+        assert_true(e.ports[0] instanceof window.MessagePort);
+        resolve(e.ports[0]);
+      } catch (e) {
+        reject(e);
+      }
+    };
+  });
+}
+
+/**
+ * Create a new MessageChannel and transfers one of the ports to
+ * the window which opened the window with a remote context provided
+ * as an argument, and immediately closes the entangled port.
+ *
+ * @param {RemoteContextWrapper} remoteContextWrapper
+ */
+async function createMessageChannelAndSendPortFollowedByClose(remoteContextWrapper) {
+  await remoteContextWrapper.executeScript(() => {
+    const {port1, port2} = new MessageChannel();
+    port1.start();
+    window.opener.postMessage({}, '*', [port2]);
+    port1.close();
+  });
+}
+
 /**
  * Create a new MessageChannel and transfers one of the ports to
  * the window which opened the window with a remote context provided