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This reverts to the older purging logic behind a feature flag (for non-unified consent). We can see if this changes the metrics as expected. If unclear, we can do an A/B test since this is also behind a Feature.

Added a simple boolean histogram to count how often we are purging on sync changes.

Bug: 891777
Change-Id: I74596d4a92eb19de301461d2b6d18a6dca8741c4
Reviewed-on: https://chromium-review.googlesource.com/c/1258573Reviewed-by: Robert Kaplow (sloooow) <rkaplow@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Robert Kaplow (sloooow) <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596423}