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Directory implementation stores keystore keys in sync prefs. Since
missing keystore keys from the response are possible and can cause
significant sync issues (such as infinite configuration sync cycles),
it's worth to support their migration.

Packed keystore keys are propagated through the bridge constructor
and passed to SetKeystoreKeys() if following conditions satisfied:
1. There are some keystore keys in preferences.
2. There is no errors during unpacking keystore keys.
3. Bridge didn't yet received any keystore keys (i.e. they weren't
restored from Nigori storage).

Bug: 1030736, 922900
Change-Id: I4419da22dbe010e226dae61fdc4164d3a37b5e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950946
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721614}