Disable back-to-redirect-with-frame.php on Site Isolation Win FYI bot.

This test has been reenabled in
https://codereview.chromium.org/2136873002, but unfortunately it's
still failing on the Windows FYI bot.

BUG=585194
NOTRY=true
TBR=creis@chromium.org

Review-Url: https://codereview.chromium.org/2162513003
Cr-Commit-Position: refs/heads/master@{#406155}
1 file changed