Revert of Add SyncScheduler for scheduling CryptAuth enrollments and syncing devices.

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
Committed: https://crrev.com/917821a054626f8e445ebcbc9e93687d79e51842
Cr-Commit-Position: refs/heads/master@{#330780}

[eugenis, 2015-05-20 18:55:42]

Created Revert of Add SyncScheduler for scheduling CryptAuth enrollments and
syncing devices.

[commit-bot: I haz the power, 2015-05-20 18:56:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1146193002/1

[commit-bot: I haz the power, 2015-05-20 18:57:55]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-20 18:58:50]

Patchset 1 (id:??) landed as
https://crrev.com/917821a054626f8e445ebcbc9e93687d79e51842
Cr-Commit-Position: refs/heads/master@{#330780}