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Closed objects with no references are garbage collected.
Non-closed objects are not garbage collected.

NOTE: This uses a very primitive mechanism (static variable) for
collecting the count. It should use a more reasonable one, and the
accessor should be marked "only visible in testing". Advice on how
to best do that appreciated.

Bug: 782099
Change-Id: If44f9e6ecaabc8f0dfebe3ee959c5179308f2b0b
Reviewed-on: https://chromium-review.googlesource.com/806195Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521679}