Bug 1608974 [wpt PR 21150] - Ignore unexpected MessageEvents, a=testonly

Automatic update from web-platform-tests
Ignore unexpected MessageEvents (#21150)

--

wpt-commits: 2aad06617dd072cca5a1bcc6d0fc624934c689a4
wpt-pr: 21150

testing/web-platform/tests/payment-request/allowpaymentrequest/removing-allowpaymentrequest.https.sub.html

@@ -27,6 +27,9 @@ async_test((t) => {
   });
 
   window.onmessage = t.step_func((e) => {
+    // Ignore messages that are not part of the test.
+    if (e.source != iframe.contentWindow) return;
+
     i++;
     if (i === 1) {
       // 5. This is the first message we receive, from the first load.

testing/web-platform/tests/payment-request/allowpaymentrequest/setting-allowpaymentrequest-timing.https.sub.html

@@ -22,11 +22,15 @@ async_test((t) => {
     iframe.contentWindow.postMessage('What is the result of new PaymentRequest(...)?', '*');
   });
 
-  window.onmessage = t.step_func_done((e) => {
+  window.onmessage = t.step_func((e) => {
+    // Ignore messages that are not part of the test.
+    if (e.source != iframe.contentWindow) return;
+
     assert_equals(e.data.message, 'Exception');
     assert_equals(4, e.data.details.length);
     // The last entry is the error stacktrace. Ignore it in comparison.
     assert_array_equals(e.data.details.slice(0, 3), [true /* ex instanceof DOMException */, DOMException.SECURITY_ERR, 'SecurityError']);
+    t.done();
   });
 
   document.body.appendChild(iframe);

testing/web-platform/tests/payment-request/allowpaymentrequest/setting-allowpaymentrequest.https.sub.html

@@ -20,6 +20,9 @@ async_test((t) => {
   });
 
   window.onmessage = t.step_func((e) => {
+    // Ignore messages that are not part of the test.
+    if (e.source != iframe.contentWindow) return;
+
     i++;
     if (i === 1) {
       assert_equals(e.data.message, 'Exception', 'before navigation');