Fix ScopedTestNSSDB for older NSS versions.

Fix ScopedTestNSSDB for older NSS versions.

Before, if NSS version was < 3.15.1, then the ScopedTempDir was destructed without ScopedAllowIO and lead to a thread restriction violation.

Now, the temp dir is not deleted in this case as the NSS DB is left open.

BUG=210525
TBR=rsleevi@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287257

[pneubeck (no reviews), 2014-08-03 09:59:48]

We should investigate next week what the correct handling of the temp dir is.
For now this fix should be fine.

[pneubeck (no reviews), 2014-08-03 10:00:02]

The CQ bit was checked by pneubeck@chromium.org

[commit-bot: I haz the power, 2014-08-03 10:00:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/pneubeck@chromium.org/423363005/1

[pneubeck (no reviews), 2014-08-03 11:36:06]

The CQ bit was unchecked by pneubeck@chromium.org

[pneubeck (no reviews), 2014-08-03 11:36:32]

The CQ bit was checked by pneubeck@chromium.org

[commit-bot: I haz the power, 2014-08-03 11:36:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/pneubeck@chromium.org/423363005/1

[commit-bot: I haz the power, 2014-08-03 12:47:46]

Change committed as 287257