Don't send IPC replies through dead frames.

This is a followup to https://crrev.com/c/1512658 .

Bug: 870606
Change-Id: Ic73e1e943baeb9987cfb1caf57f8318fb0aec92f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529472
Commit-Queue: Avi Drissman <avi@chromium.org>
Auto-Submit: Avi Drissman <avi@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#641984}
1 file changed