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Currently, IsEnabledSmartLockBranding returns true if Finch agrees and the user syncs (anything). It should only return true if Finch agrees and the user syncs passwords without a custom passphrase.

BUG=400674,486739

Review URL: https://codereview.chromium.org/1134343002

Cr-Commit-Position: refs/heads/master@{#329649}