Restore PendingScript prefinalizer.

Restore PendingScript prefinalizer.

Under some as yet unknown conditions, PendingScript objects can become garbage
without having been explicitly detached/disposed of first. Hence restore the
prefinalizer that r396656 removed.

R=
BUG=615977
Committed: https://crrev.com/0c49fbd993f6e61520554e115a3bf04ba9d2d4f8
Cr-Commit-Position: refs/heads/master@{#396813}

[sof, 2016-05-31 09:24:22]

sigbjornf@opera.com changed reviewers:
+ haraken@chromium.org

[sof, 2016-05-31 09:24:22]

please take a look.

[haraken, 2016-05-31 09:31:33]

LGTM

[sof, 2016-05-31 09:34:00]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-05-31 09:34:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2021773004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2021773004/1

[commit-bot: I haz the power, 2016-05-31 10:58:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-31 11:00:13]

Description was changed from

==========
Restore PendingScript prefinalizer.

Under some as yet unknown conditions, PendingScript objects can become garbage
without having been explicitly detached/disposed of first. Hence restore the
prefinalizer that r396656 removed.

R=
BUG=615977
==========

to

==========
Restore PendingScript prefinalizer.

Under some as yet unknown conditions, PendingScript objects can become garbage
without having been explicitly detached/disposed of first. Hence restore the
prefinalizer that r396656 removed.

R=
BUG=615977

Committed: https://crrev.com/0c49fbd993f6e61520554e115a3bf04ba9d2d4f8
Cr-Commit-Position: refs/heads/master@{#396813}
==========

[commit-bot: I haz the power, 2016-05-31 11:00:14]

Patchset 1 (id:??) landed as
https://crrev.com/0c49fbd993f6e61520554e115a3bf04ba9d2d4f8
Cr-Commit-Position: refs/heads/master@{#396813}