Add suggestion to use "no-cors" with Fetch fails CORS check.

LayoutTests/http/tests/xmlhttprequest/access-control-repeated-failed-preflight-crash-expected.txt

Index: LayoutTests/http/tests/xmlhttprequest/access-control-repeated-failed-preflight-crash-expected.txt
diff --git a/LayoutTests/http/tests/xmlhttprequest/access-control-repeated-failed-preflight-crash-expected.txt b/LayoutTests/http/tests/xmlhttprequest/access-control-repeated-failed-preflight-crash-expected.txt
index 4dcc1acec3e9bedf85ac781f20e6bc631bdd4548..3bd79a95cf1de24dea1e2ddb0f70884550287243 100644
--- a/LayoutTests/http/tests/xmlhttprequest/access-control-repeated-failed-preflight-crash-expected.txt
+++ b/LayoutTests/http/tests/xmlhttprequest/access-control-repeated-failed-preflight-crash-expected.txt
@@ -1,7 +1,7 @@
-CONSOLE ERROR: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. 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: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. 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: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. 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: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. 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: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. 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: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. 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: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access. Alternatively, if you want an opaque response, switch to The Fetch API in 'no-cors' mode.
+CONSOLE ERROR: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access. Alternatively, if you want an opaque response, switch to The Fetch API in 'no-cors' mode.
+CONSOLE ERROR: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access. Alternatively, if you want an opaque response, switch to The Fetch API in 'no-cors' mode.
+CONSOLE ERROR: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access. Alternatively, if you want an opaque response, switch to The Fetch API in 'no-cors' mode.
+CONSOLE ERROR: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access. Alternatively, if you want an opaque response, switch to The Fetch API in 'no-cors' mode.
+CONSOLE ERROR: XMLHttpRequest cannot load http://localhost:8000/xmlhttprequest/resources/access-control-basic-denied.cgi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access. Alternatively, if you want an opaque response, switch to The Fetch API in 'no-cors' mode.
 PASS