Rework EventSource CORS tests to be usable from Workers.

LayoutTests/http/tests/eventsource/workers/eventsource-csp-redirect-expected.txt

Index: LayoutTests/http/tests/eventsource/workers/eventsource-csp-redirect-expected.txt
diff --git a/LayoutTests/http/tests/eventsource/workers/eventsource-csp-redirect-expected.txt b/LayoutTests/http/tests/eventsource/workers/eventsource-csp-redirect-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..89d256b651a40577370713bdd127f78622aeb5e4
--- /dev/null
+++ b/LayoutTests/http/tests/eventsource/workers/eventsource-csp-redirect-expected.txt
@@ -0,0 +1,14 @@
+CONSOLE ERROR: Refused to connect to 'http://127.0.0.1:8080/resources/redirect.php' because it violates the following Content Security Policy directive: "connect-src http://127.0.0.1:8000/js-test-resources/js-test.js http://127.0.0.1:8000/resources/redirect.php".
+
+[Worker] Test that basic EventSource cross-origin requests fail on blocked CSP redirect.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Starting worker: ../script-tests/eventsource-csp-redirect.js
+PASS [Worker] es = new EventSource("http://127.0.0.1:8000/resources/redirect.php?code=307&cors_enabled&url=http://127.0.0.1:8080/resources/redirect.php") did not throw exception.
+PASS [Worker] es.readyState is EventSource.CLOSED
+PASS successfullyParsed is true
+
+TEST COMPLETE
+