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

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

Index: LayoutTests/http/tests/security/link-crossorigin-stylesheet-no-cors-expected.txt
diff --git a/LayoutTests/http/tests/security/link-crossorigin-stylesheet-no-cors-expected.txt b/LayoutTests/http/tests/security/link-crossorigin-stylesheet-no-cors-expected.txt
index d779ade3d4fd7a6a0eb267b56c4a6464ac0523b4..96796440c51e7ccca859b0424a22da7914354963 100644
--- a/LayoutTests/http/tests/security/link-crossorigin-stylesheet-no-cors-expected.txt
+++ b/LayoutTests/http/tests/security/link-crossorigin-stylesheet-no-cors-expected.txt
@@ -1,7 +1,7 @@
-CONSOLE ERROR: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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: CSS stylesheet from origin 'http://localhost:8080' 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.
 PASS 
 PASS 
 PASS