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- This will enable SharingService to register in transport mode once
  1) DeviceInfo is in transport mode (SyncDeviceInfoInTransportMode)
  2) FCM/encryption info in DeviceInfo (SharingUseDeviceInfo)
  3) VAPID key derive from sync (SharingDeriveVapidKey)
- For required sync data types:
  - DEVICE_INFO is always required
  - kSharingUseDeviceInfo disabled -> require PREFERENCES
  - kSharingDeriveVapidKey disabled -> require PREFERENCES

Bug: 1010968
Change-Id: I78aaa6c4ee00098d4c6cbe9ebf9aa922733ed3ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837935
Commit-Queue: Alex Chau <alexchau@chromium.org>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702830}