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This CL enables SyncUSSNigori by default, because it should be launched
soon and removes one Directory-specific test, which is not relevant
once USS implementation is enabled for all datatypes.

Bug: 922900
Change-Id: I0f6c71a4a1a6a06a3fed510e11d28b770972c6c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2074700
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#745034}