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It was used for the ClearServerData flow which has been removed. All
the code removed by this CL was efficiently no-op, since
saved_nigori_state was never set.

Bug: 490836
Change-Id: Idcb658e229b983f006937e943baaf9aade5ac8f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1583735
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654873}