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This extends the LevelDBWrapperImpl API to enable users of that class to
fixup broken data in the database. That API is then used to fix
incorrectly encoded keys, which should fix all weirdness around
removeItem that was being observed.

BUG=765524

Change-Id: I4049445d46d30925774c2fec9dfd4dcdaba12e04
Reviewed-on: https://chromium-review.googlesource.com/678250Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Michael Nordman <michaeln@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504251}