CSS: Cleanup unused code and redundant test.

* Remove allow_rule_access_from_origin_ which is no longer used after
  https://chromium-review.googlesource.com/c/chromium/src/+/1367331.
* Remove http/tests/security/cannot-read-cssrules-redirect.html which is
  redundant with the WPT test
  css/cssom/stylesheet-same-origin.sub.html, which is passing after
  https://chromium-review.googlesource.com/c/chromium/src/+/1367331.

Bug: 911974
Change-Id: I5047589f84ab371680390433f2c3d1c430d6cf6b
Reviewed-on: https://chromium-review.googlesource.com/c/1372989
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616586}
5 files changed