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SubscribeForSyncInvalidations flag is removed, and mostly replaced by
the new flag SyncSendInterestedDataTypes. If that flag is enabled,
SyncInvalidationsService is created, and the set of interested data
types is sent to the server (as part of DeviceInfo).

New flag UseSyncInvalidations is introduced. If both
SyncSendInterestedDataTypes and this flag are enabled, FCMHandler can
register with FCM and listen to new invalidations. Also, FCM token will
be included in DeviceInfo.

Unsubscribing from old invalidations behind these flags will be added
in a separate CL.

Bug: 1082115
Change-Id: I66eb2f254473d2f897cc15f054dcd6dafdc76708
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429008Reviewed-by: Rushan Suleymanov <rushans@google.com>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Paula Vidas <paulavidas@google.com>
Cr-Commit-Position: refs/heads/master@{#811150}