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There is no actual pre-USS datatype running and the code related to
syncable::Directory is dead. Some of these concepts had leaked into
higher layers in sync/driver, so this patch deletes them prior to
deleting the functionality within the sync engine.

In order to achieve this, SyncManagerImpl now takes ownership of
UserShare and NigoriHandler, but this should cause no behavioral
differences.

Change-Id: I56f7f325f87206b985c064bb1c5e97acb7b05980
Bug: 923287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264432
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#782861}