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When transactions are aborted, any get all operations should still send
an error with a valid receiver.  This avoids a dcheck (and probable
crash later) from mojo due to passing a null receiver.

Bug: 1110781
Change-Id: If142072cae93f29dc3d4c1ac388bc27a3f3939f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324525
Commit-Queue: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792837}