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If we erase all of the history we should reset the
entire Media History database. We do this by deleting
the database and creating a new one.

BUG=1024352

Change-Id: I14589cdee5ed8b807d0463f1efb5ccfb6d7e7d9f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1990218
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737522}