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

LayoutTests/http/tests/security/link-crossorigin-subresource-no-cors-expected.txt

Index: LayoutTests/http/tests/security/link-crossorigin-subresource-no-cors-expected.txt
diff --git a/LayoutTests/http/tests/security/link-crossorigin-subresource-no-cors-expected.txt b/LayoutTests/http/tests/security/link-crossorigin-subresource-no-cors-expected.txt
index 00c1ae95d0c2d0a04c0c2fd76f7e5f2c7b759d15..30c09dc9e7e9129a8910f3e640ce5e00d11ee194 100644
--- a/LayoutTests/http/tests/security/link-crossorigin-subresource-no-cors-expected.txt
+++ b/LayoutTests/http/tests/security/link-crossorigin-subresource-no-cors-expected.txt
@@ -1,7 +1,7 @@
-CONSOLE ERROR: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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: Link subresource from origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: 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.
 Test that a subresource with a crossorigin attribute does not load a cross-origin resource that isn't CORS enabled.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".