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We write NigoriLocalData in encrypted form to corresponding file using
ImportantFileWriter. Reading is just mirrored version of writing.

Bug: 922900
Change-Id: I299f55450e74edac29beaacf7b5dc659f5fd8f8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768424
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690014}