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Not having FrameReplicationState::has_received_user_gesture in the
struct traits caused it to not propagate through IPCs properly, and
was caught by a couple of autoplay layout test failures, which had
been failing with site isolation enabled.  Thanks to mustaq@ for the
analysis that led to the discovery of this bug.

FrameReplicationState::active_sandbox_flags was similarly missing from
the struct traits, so that member is fixed as well.

Bug: 794631
Change-Id: I3ebdb51ff887b79c18c4a7c593fac33bb3333a0d
Reviewed-on: https://chromium-review.googlesource.com/981306Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545969}