GitLab

What:
Delete data from conversions database on exit for origins which are
configured to be session only.

Why:
This better aligns conversion storage with other site data
implementations.

How:
When the ConversionManager for a given storage partition is tore down,
we queue a clear data task which deletes all conversion data whose
origins match a session only origin.

Note that as is, using ClearData() with the new filter will be
rather un-performant as it will trigger a host settings lookup on
every invocation of the filter. This is being addressed on
https://crrev.com/c/2568367

Bug: 1154453
Change-Id: If6f250ddd3329dfb595db3b83e2601b22a49c2c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567626
Commit-Queue: John Delaney <johnidel@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838274}