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Prior to this patch, DataTypeManagerImpl::Restart() used
IsPassphraseRequired() as the way to determine whether encrypted
datatypes should enter the crypto-error state.

This patch generalizes the concept to accomodate the
trusted-vault-keys case, which doesn't have a corresponding API to
IsPassphraseRequired().

To achieve this without poluting the public APIs,
DataTypeEncryptionHandler is decoupled from SyncUserSettings.

Bug: 1010189
Change-Id: Ia75f30d11d0c9077c301d6245ac51b5a810b5a7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873753
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708622}