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Locks were assumed to be granted synchronously when all previous locks
were destructed. This isn't the case when there is a chain of dependent
locks, as granting a lock posts a task.

Since the delete code doesn't need a transaction to work (yet), remove
the locks here, and refactor this area for the new Scopes integration.

R=pwnall@chromium.org

Bug: 945370
Change-Id: Ifce3163852db6b2eae2127ee7062e788a19b9546
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539211Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644653}