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Logs messages of navigation are retained in PreviewsLogger bufffer, and
on chrome://interventions-internals until the end of that session even
when user history is cleared.

Since ClearBlacklist event is triggered whenever history is cleared,
removing all log message on the page, and all buffer messages in
PreviewsLogger seems like a reasonable solution.

Bug: 791774
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I0f69f5ec89679826557cdd23bbd1f316957711ec
Reviewed-on: https://chromium-review.googlesource.com/807397Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Thanh Le <thanhdle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521747}