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A check is added to ensure that transactions that have already been sent
a commit signal from the front end (for whatever reason) are committed
instead of aborted in the event of an abort.

Spec Change: https://github.com/w3c/IndexedDB/pull/242

Explainer: https://andreas-butler.github.io/idb-transaction-commit/EXPLAINER
Change-Id: I942136c1bbfb8a5347bf7cf1f9702f5cbff66521
Reviewed-on: https://chromium-review.googlesource.com/c/1330692
Commit-Queue: Andreas Butler <andreasbutler@google.com>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Chase Phillips <cmp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619859}