Clearing browsing history for any site effectively clears data for all sites #393
Description
The clear browsing history for attribution algorithm takes a set of sites to support only clearing data for certain sites.
However, any call (with forgetVisits true) sets the last browsing history clear. While the note below the algorithm acknowledges that this "will make some impressions unreachable", it seems to make all existing impressions unusable.
Is this the expected behavior? If so, should we consider updating that note and modifying the algorithm to just clear all three stores unconditionally?