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No behavioral changes: the API and implementation of SyncServiceCrypto
are decoupled from the enum that is designed for SyncEncryptionHandler,
a lower-level interface.

Bug: 1010189
Change-Id: Icd8d3124a93a928535894f877b64ade53bcd1e53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834226
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701963}