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This gets rid of fake implementations of the LevelDBDatabase mojom
interface and refactors all dependent tests to use a real
in-memory LevelDBDatabaseImpl instead.

Local/SessionStorageContextMojo are updated to use a LevelDBDatabaseImpl
directly, and other DOM storage classes can by updated similarly in
follow-up CLs. This is a step in incrementally deleting the
LevelDBDatabase mojom interface and migrating DOM storage implementation
to consume a DomStorageDatabase directly.

Bug: 1000959
Change-Id: Ieaa8e46a6ebc0f41dc85b3c60423552c88cb0c6a
Tbr: sky@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837145
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704376}