Block URLs with Chrome Bundle URL scheme from Launching in iframes.

More context in crbug.com/822518

Bug: 850760, 822518
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I66e86fdc9813456ead16b1c43c41ac218ff2ac0a
Reviewed-on: https://chromium-review.googlesource.com/1147861
Commit-Queue: Mohammad Refaat <mrefaat@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578489}