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The patch migrates away from some APIs that won't exist in the future
and adopts NigoriKeyBag more broadly to avoid dealing with strings.

Bug: 967417
Change-Id: Ieb4b9461fe2a4704b79539994ce92b9e25bff2b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1821780
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#699772}