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Previous attempts at trying to fix the cursor lifetime issue assumed
that it was related to ownership while passing refcounted objects across
thread boundaries. This patch, instead, frees the passed cursor
depending on how it was created.

Bug: 800219
Change-Id: Iaee3748716b155dfd180923712838870cfb21c47
Reviewed-on: https://chromium-review.googlesource.com/864833Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Elliot Glaysher <erg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531711}