Gardening: origin-whitelisting-https.html is flaky.

BUG=295538
TBR=japhet@chromium.org

Review URL: https://codereview.chromium.org/24241008

git-svn-id: svn://svn.chromium.org/blink/trunk@158099 bbb929c8-8fbe-4397-9dbb-9b2b20218538