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In order to simplify initialization of SyncEncryptionHandler and its
dependencies and upcoming transfer of SyncEncryptionHandler ownership,
SynEncryptionHandler now exposes Cryptographer, NigoriHandler and
KeystoreKeysHandler. USS implementation of SyncEncryptionHandler (aka
NigoriSyncBridgeImpl) returns nullptrs as Cryptographer and
NigoriHandler, since they are needed only in Directory world.

Bug: 922900
Change-Id: I519d4f682ab990fdefadfdfedda713df14fea2a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1645779
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667094}