Delete session cookies immediately after loading the cookie DB. (attempt #2)

Delete session cookies immediately after loading the cookie DB. (attempt #2)

The original CL had non-determinism in the unit test.

> Delete session cookies immediately after loading the cookie DB.
>
> Previously, the session cookies were deleted after all cookies were loaded into
> memory. This allows for a race condition where new session cookies are inserted
> into the database while the cookies are being loaded into memory, which causes
> the new session cookies to also be deleted.
>
> BUG=
>
> Committed: https://crrev.com/ca924dcfb4f3c6b89e0c40898e42aec349b6b843
> Cr-Commit-Position: refs/heads/master@{#326672}

BUG=

Committed: https://crrev.com/016a5fdb25122fdd84afa9e12678ae7d209e567d
Cr-Commit-Position: refs/heads/master@{#327104}

[erikchen, 2015-04-25 01:06:12]

erikchen@chromium.org changed reviewers:
+ erikwright@chromium.org

[erikchen, 2015-04-25 01:06:13]

erikwright: PTAL

You can diff patch set 2 against patch set 1 to see the differences.

[erikwright (departed), 2015-04-27 18:48:48]

LGTM

[erikchen, 2015-04-27 18:52:04]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2015-04-27 18:52:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1103003002/20001

[commit-bot: I haz the power, 2015-04-27 19:49:46]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-27 19:50:41]

Patchset 2 (id:??) landed as
https://crrev.com/016a5fdb25122fdd84afa9e12678ae7d209e567d
Cr-Commit-Position: refs/heads/master@{#327104}