Rework EventSource CORS tests to be usable from Workers.

LayoutTests/http/tests/eventsource/eventsource-cors-with-credentials-expected.txt

Index: LayoutTests/http/tests/eventsource/eventsource-cors-with-credentials-expected.txt
diff --git a/LayoutTests/http/tests/eventsource/eventsource-cors-with-credentials-expected.txt b/LayoutTests/http/tests/eventsource/eventsource-cors-with-credentials-expected.txt
index 17b48a866b803f617827e42becefe0522eb544cc..120824845dda360f3aab05a95293fdae7faa5356 100644
--- a/LayoutTests/http/tests/eventsource/eventsource-cors-with-credentials-expected.txt
+++ b/LayoutTests/http/tests/eventsource/eventsource-cors-with-credentials-expected.txt
@@ -1,12 +1,30 @@
-CONSOLE ERROR: EventSource cannot load http://localhost:8000/eventsource/resources/es-cors-credentials.php?count=1. A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
-CONSOLE ERROR: EventSource cannot load http://localhost:8000/eventsource/resources/es-cors-credentials.php?count=2. A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
-CONSOLE ERROR: EventSource cannot load http://localhost:8000/eventsource/resources/es-cors-credentials.php?count=3. Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. It must be 'true' to allow credentials.
-Test that EventSource cross-origin requests with credentials fail until the correct CORS headers are sent. Should print a series of PASS messages followed by DONE.
-
-PASS: got error event and readyState is CLOSED
-PASS: got error event and readyState is CLOSED
-PASS: got error event and readyState is CLOSED
-PASS: got cross-origin message event with data "DATA1" and lastEventId "77"
-PASS: got cross-origin message event with data "DATA2"
-DONE
+CONSOLE ERROR: EventSource cannot load http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=1. A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
+CONSOLE ERROR: EventSource cannot load http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=2. A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
+CONSOLE ERROR: EventSource cannot load http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=3. Credentials flag is 'true', but the 'Access-Control-Allow-Credentials' header is ''. It must be 'true' to allow credentials.
+Test that EventSource cross-origin requests with credentials fail until the correct CORS headers are sent.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=1", {'withCredentials': true}) did not throw exception.
+PASS es.withCredentials is true
+PASS count != 4 && count != 5 is true
+PASS es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=2", {'withCredentials': true}) did not throw exception.
+PASS es.withCredentials is true
+PASS count != 4 && count != 5 is true
+PASS es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=3", {'withCredentials': true}) did not throw exception.
+PASS es.withCredentials is true
+PASS count != 4 && count != 5 is true
+PASS es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-credentials.php?count=4", {'withCredentials': true}) did not throw exception.
+PASS es.withCredentials is true
+PASS evt.origin.indexOf('http://127.0.0.1:8080') === 0 is true
+PASS evt.data is "DATA1"
+PASS evt.lastEventId is "77"
+PASS count is 5
+PASS evt.origin.indexOf('http://127.0.0.1:8080') === 0 is true
+PASS count is 5
+PASS evt.data is "DATA2"
+PASS successfullyParsed is true
+
+TEST COMPLETE