Rework EventSource CORS tests to be usable from Workers.

LayoutTests/http/tests/eventsource/workers/eventsource-cors-basic-expected.txt

Index: LayoutTests/http/tests/eventsource/workers/eventsource-cors-basic-expected.txt
diff --git a/LayoutTests/http/tests/eventsource/workers/eventsource-cors-basic-expected.txt b/LayoutTests/http/tests/eventsource/workers/eventsource-cors-basic-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..69c503e4e161fb53b11ef78944e6852283b00982
--- /dev/null
+++ b/LayoutTests/http/tests/eventsource/workers/eventsource-cors-basic-expected.txt
@@ -0,0 +1,29 @@
+CONSOLE ERROR: EventSource cannot load http://127.0.0.1:8080/eventsource/resources/es-cors-basic.php?count=1. No 'Access-Control-Allow-Origin' header is present on the requested resource. 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-basic.php?count=2. The 'Access-Control-Allow-Origin' header has a value 'http://some.other.origin:80' that is not equal to the supplied origin. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
+[Worker] Test that basic EventSource cross-origin requests fail until they are allowed by the Access-Control-Allow-Origin header.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Starting worker: ../script-tests/eventsource-cors-basic.js
+PASS [Worker] es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-basic.php?count=1") did not throw exception.
+PASS [Worker] es.withCredentials is false
+PASS [Worker] es.readyState is es.CLOSED
+PASS [Worker] count != 3 && count != 4 is true
+PASS [Worker] es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-basic.php?count=2") did not throw exception.
+PASS [Worker] es.withCredentials is false
+PASS [Worker] es.readyState is es.CLOSED
+PASS [Worker] count != 3 && count != 4 is true
+PASS [Worker] es = new EventSource("http://127.0.0.1:8080/eventsource/resources/es-cors-basic.php?count=3") did not throw exception.
+PASS [Worker] es.withCredentials is false
+PASS [Worker] evt.origin.indexOf('http://127.0.0.1:8080') === 0 is true
+PASS [Worker] evt.data == 'DATA1' && evt.lastEventId == '77' is true
+PASS [Worker] count is 4
+PASS [Worker] evt.origin.indexOf('http://127.0.0.1:8080') === 0 is true
+PASS [Worker] count is 4
+PASS [Worker] evt.data is "DATA2"
+[Worker] DONE
+PASS successfullyParsed is true
+
+TEST COMPLETE
+