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Revert of Add SyncScheduler for scheduling CryptAuth enrollments and syncing devices. (patchset #3 id:80001 of https://codereview.chromium.org/1147563002/)

Reason for revert:
MSan and Valgrind failures (use-of-uninitialized memory).

Original issue's description:
> Add SyncScheduler for scheduling CryptAuth enrollments and syncing devices.
>
> BUG=420315
> TEST=unit test
>
> Committed: https://crrev.com/27e044cfc5c2a43b6c575508aca64763bfa2deba
> Cr-Commit-Position: refs/heads/master@{#330713}

TBR=isherman@chromium.org,tengs@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=420315

Review URL: https://codereview.chromium.org/1146193002

Cr-Commit-Position: refs/heads/master@{#330780}