[XHR] Replace whitelist with cors-safelisted

This is aligned with the spec.

Bug: 1097231
Change-Id: Id93081fa764431917e4f6d3c3313df17535186a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309612Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790315}

third_party/blink/web_tests/external/wpt/xhr/access-control-basic-cors-safelisted-response-headers.htm

@@ -12,7 +12,7 @@
       const xhr = new XMLHttpRequest;
 
       xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN +
-          "/xhr/resources/access-control-basic-whitelist-response-headers.py", false);
+          "/xhr/resources/access-control-basic-cors-safelisted-response-headers.py", false);
       xhr.send();
 
       assert_not_equals(xhr.getResponseHeader("cache-control"), null);