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We need to remove all stored sync metadata when user disabled sync.
Nigori is not user type, so we have to remove everything related in
this case. NigoriStorage::ClearData() just removes the corresponding
file.

Bug: 922900
Change-Id: Icfbb27f4a693122b3d048bdba857764d5dd83a97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1782848
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693149}