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Before this patch, payment credential storage and retrieval did not
cancel database operations when secure payment confirmation was being
torn down, so the database operation callbacks could use secure payment
confirmation code path after free.

This patch cancels the payment credential storage and retrieval
operations during the tear down.

After this patch, there is no use-after-free errors when a database
operation is in flight during secure payment confirmation tear down.

Bug: 1136078
Change-Id: I2a02089f4ab5c3c8ae5ebed91304b11e1c1eaf36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518924Reviewed-by: Nick Burris <nburris@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824186}