Flaky Test: http/tests/security/cookies/third-party-cookie-blocking-user-action.html
https://bugs.webkit.org/show_bug.cgi?id=114511

Clear the test cookie at the beginning of the test to avoid failing if
the cookie is still around from a previous test.

Reviewed by Alexey Proskuryakov.

* http/tests/security/cookies/third-party-cookie-blocking-user-action.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148532 268f45cc-cd09-0410-ab3c-d52691b4dbfc