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CL enables the deletion of access records which effectively contain
browsing history by extending the AccessContextAuditService as a
HistoryServiceObserver.

Access records are deleted for top frame origins when the service is
notified that no more history entries exist for that origin.

Bug: 1101675
Change-Id: If98eda4d27f35a92f6580231d7a4c67179aa3dae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288085
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791721}