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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=

Review URL: https://codereview.chromium.org/1103003002

Cr-Commit-Position: refs/heads/master@{#327104}