Bug 1642564 [wpt PR 23907] - COEP: do not test exception message, a=testonly

Automatic update from web-platform-tests
COEP: do not test exception message

It's implementation-defined, see https://bugzilla.mozilla.org/show_bug.cgi?id=1642149.
--

wpt-commits: 5cf5c990b4e55923a055a04614dec1afa0439f9d
wpt-pr: 23907

testing/web-platform/tests/html/cross-origin-embedder-policy/require-corp-sw.https.html

@@ -32,7 +32,7 @@ promise_test(async t => {
       navigator.serviceWorker.addEventListener('message', resolve,
                                                {once: true}));
   worker.postMessage('WithoutCorp');
-  assert_equals((await p).data, 'TypeError: Failed to fetch');
+  assert_equals((await p).data, 'Exception: TypeError');
 }, "fetch() to no CORP response should not succeed.");
 
 promise_test(async t => {

testing/web-platform/tests/html/cross-origin-embedder-policy/resources/require-corp-sw.js

@@ -19,7 +19,7 @@ self.addEventListener('message', e => {
       const response = await fetch(url, { mode: 'no-cors' });
       result = response.type;
     } catch (error) {
-      result = `${error.name}: ${error.message}`;
+      result = `Exception: ${error.name}`;
     } finally {
       e.source.postMessage(result);
     }