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This deletes LevelDBService and moves LevelDBDatabaseImpl off of Mojo
pipes. A generated mojom interface is still used for now, but calls go
directly into a LevelDBDatabaseImpl.

LevelDBDatabaseImpl is reimplemented in terms of DomStorageDatabase from
the Storage Service. This will allow the many call sites into this class
to be incrementally adapted to directly use the underlying
DomStorageDatabase. Once that migration is complete,
components/services/leveldb/ can be deleted.

Bug: 1000959
Change-Id: I8cd604b895b995de4723cd572e6cc6f67fa5d43e
Tbr: sky@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827186
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701360}