drive: Delete unused ID entries from an already updated DB

drive: Delete unused ID entries from an already updated DB

BUG=374648
TEST=unit_tests

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272495

[kinaba, 2014-05-23 05:01:09]

lgtm

[hashimoto, 2014-05-23 05:05:42]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-05-23 05:07:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/299623012/1

[commit-bot: I haz the power, 2014-05-23 06:00:33]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[commit-bot: I haz the power, 2014-05-23 07:11:55]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-23 07:11:55]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[hashimoto, 2014-05-23 08:37:05]

The CQ bit was checked by hashimoto@chromium.org

[commit-bot: I haz the power, 2014-05-23 08:38:24]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hashimoto@chromium.org/299623012/1

[commit-bot: I haz the power, 2014-05-23 11:40:07]

Change committed as 272495