Revert of [GCM] Start GCMChannelStatusSyncer when GCM is disabled

Revert of [GCM] Start GCMChannelStatusSyncer when GCM is disabled (patchset #2 id:20001 of https://codereview.chromium.org/653843003/)

Reason for revert:
Reverted due to that the fix is not complete. Will fix one more issue we find and reland the patch.

Original issue's description:
> [GCM] Start GCMChannelStatusSyncer when GCM is disabled
>
> We need to start GCMChannelStatusSyncer when GCM is disabled in order
> to poll the server to find out when it is reenabled.
>
> Also if server returns empty response, we should not treat it as error
> and trigger the backoff logic.
>
> BUG=423415
> TEST=new tests added
>
> Committed: https://crrev.com/9e9dd3b7798b3500d70941af04b1325ef9a0b544
> Cr-Commit-Position: refs/heads/master@{#299518}

TBR=fgorski@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=423415
Committed: https://crrev.com/cd886410d9df48ab930f5bfdfdf761b2ecf4ba76
Cr-Commit-Position: refs/heads/master@{#299579}

[jianli, 2014-10-14 23:13:10]

Created Revert of [GCM] Start GCMChannelStatusSyncer when GCM is disabled

[commit-bot: I haz the power, 2014-10-14 23:14:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/657703002/1

[commit-bot: I haz the power, 2014-10-14 23:16:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-14 23:17:18]

Patchset 1 (id:??) landed as
https://crrev.com/cd886410d9df48ab930f5bfdfdf761b2ecf4ba76
Cr-Commit-Position: refs/heads/master@{#299579}