Add redirected cases to CSP/import tests in wpt/worklets

Also this CL replaces some of empty-worklet-script.js usage
in CSP tests with empty-worklet-script-with-cors-header.js
to make sure worklets are rejected due to CSP, not CORS.

Change-Id: Ie463d206254c4c6728a79dae0ad79e4f7e333b92
Reviewed-on: https://chromium-review.googlesource.com/c/1312146
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606846}
6 files changed