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This allows our client code (coming) to load in a sandboxed iframe.

Bug: 1012578, b/144121590
Change-Id: I0e3a1442a9d2959652a36737b8b22abd4d633de9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904552
Commit-Queue: Rachel Carpenter <carpenterr@google.com>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714727}