Improve handling of CORS redirects for some resource loads.

LayoutTests/http/tests/security/img-crossorigin-redirect-anonymous-expected.txt

Index: LayoutTests/http/tests/security/img-crossorigin-redirect-anonymous-expected.txt
diff --git a/LayoutTests/http/tests/security/img-crossorigin-redirect-anonymous-expected.txt b/LayoutTests/http/tests/security/img-crossorigin-redirect-anonymous-expected.txt
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+++ b/LayoutTests/http/tests/security/img-crossorigin-redirect-anonymous-expected.txt
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+CONSOLE ERROR: Image 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: Redirect at origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
+CONSOLE ERROR: Redirect at origin 'http://localhost:8000' has been blocked from loading by Cross-Origin Resource Sharing policy: A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
+Testing the handling of CORS-enabled fetch in the presence of 'anonymous' redirects.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS/FAIL descriptions are of the form, 'CORS request type': 'redirect CORS type' => 'resource'
+
+PASS: Anonymous request: anonymous => no-CORS image resource.
+PASS: Anonymous request: anonymous => anonymous-CORS image resource.
+PASS: Credentialled request: anonymous => credentialled image resource (same origin.)
+PASS: Credentialled request: anonymous => credentialled image resource (cross origin.)
+PASS successfullyParsed is true
+
+TEST COMPLETE
+