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Reason for reland: Keep ProducerEndpoint around forever.

Managed to repro the flakiness locally and therefore fix the issue. The
SMB was kept forever but the ProducerEndpoint contains the
unique_ptr<SharedMemory> that the SMB uses which meant that when it went
away we were left with a dangling pointer.

Bug: 1007310
Change-Id: I0e5e09169e369f4c3c7d93d3b23f1931d977fc64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027368Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Auto-Submit: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737311}