Rework EventSource tests for better Worker test coverage.

LayoutTests/http/tests/eventsource/workers/eventsource-content-type-charset-expected.txt

Index: LayoutTests/http/tests/eventsource/workers/eventsource-content-type-charset-expected.txt
diff --git a/LayoutTests/http/tests/eventsource/workers/eventsource-content-type-charset-expected.txt b/LayoutTests/http/tests/eventsource/workers/eventsource-content-type-charset-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..6b85f12adcbfefe612fca13c5246b6dc0a78dfc4
--- /dev/null
+++ b/LayoutTests/http/tests/eventsource/workers/eventsource-content-type-charset-expected.txt
@@ -0,0 +1,37 @@
+CONSOLE ERROR: EventSource's response has a charset ("windows-1251") that is not UTF-8. Aborting the connection.
+CONSOLE ERROR: EventSource's response has a MIME type ("text/event-stream-foobar") that is not "text/event-stream". Aborting the connection.
+[Worker] Test EventSource with an event-stream with a Content-Type with a charset is still recognized.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Starting worker: ../script-tests/eventsource-content-type-charset.js
+PASS [Worker] es = new EventSource("/eventsource/resources/response-content-type-charset.php?contentType=text/event-stream%3B%20charset%3DUTF-8") did not throw exception.
+[Worker] Content type: text/event-stream; charset=UTF-8
+PASS [Worker] !!es.sawError is false
+PASS [Worker] es.sawMessage is true
+PASS [Worker] es.sawOpen is true
+PASS [Worker] es = new EventSource("/eventsource/resources/response-content-type-charset.php?contentType=text/event-stream%3B%20charset%3Dwindows-1251") did not throw exception.
+[Worker] Content type: text/event-stream; charset=windows-1251
+PASS [Worker] es.sawError is true
+PASS [Worker] !!es.sawMessage is false
+PASS [Worker] !!es.sawOpen is false
+PASS [Worker] es = new EventSource("/eventsource/resources/response-content-type-charset.php?contentType=text/event-stream%3B%20charset%3Dutf-8") did not throw exception.
+[Worker] Content type: text/event-stream; charset=utf-8
+PASS [Worker] !!es.sawError is false
+PASS [Worker] es.sawMessage is true
+PASS [Worker] es.sawOpen is true
+PASS [Worker] es = new EventSource("/eventsource/resources/response-content-type-charset.php?contentType=text/event-stream%3B%20charset%3D%22UTF-8%22") did not throw exception.
+[Worker] Content type: text/event-stream; charset="UTF-8"
+PASS [Worker] !!es.sawError is false
+PASS [Worker] es.sawMessage is true
+PASS [Worker] es.sawOpen is true
+PASS [Worker] es = new EventSource("/eventsource/resources/response-content-type-charset.php?contentType=text/event-stream-foobar%3B") did not throw exception.
+[Worker] Content type: text/event-stream-foobar;
+PASS [Worker] es.sawError is true
+PASS [Worker] !!es.sawMessage is false
+PASS [Worker] !!es.sawOpen is false
+PASS successfullyParsed is true
+
+TEST COMPLETE
+