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Once client received default NigoriSpecifics during initial sync it
should fill NigoriSpecifics with keystore Nigori and commit changes
to the server. This CL adds integration test for this case.

Bug: 922900
Change-Id: I6bd3443fb699aeeb3609183377204a75b76fa6cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1609823
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663018}