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When site data is removed, persistent quota gets resetted to zero.
Instead of keeping the origin in the database, we should just delete it
to remove traces of browsing_data.

Bug: 849677
Change-Id: Ice2282274012fe8d2cb65bbac0b328523e8ce666
Reviewed-on: https://chromium-review.googlesource.com/1087057Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564821}