Revert of Allow user to manually fetch remote commands

Revert of Allow user to manually fetch remote commands (patchset #3 id:40001 of https://codereview.chromium.org/1106193003/)

Reason for revert:
crash occasionally on CrOS

Original issue's description:
> Allow user to manually fetch remote commands
>
> Currently remote commands fetch depends solely on invalidation, evaluate and
> possibly remove this after invalidation service is landed and tested.
>
> BUG=480982
>
> Committed: https://crrev.com/610f47342c8d725e239513ac17727a176d161495
> Cr-Commit-Position: refs/heads/master@{#327765}

TBR=bartfab@chromium.org,estade@chromium.org
BUG=480982, 486672
Committed: https://crrev.com/d7f2f2b28ae05528a593104806e0c9975a8025b1
Cr-Commit-Position: refs/heads/master@{#329660}

[binjin, 2015-05-13 16:03:29]

Created Revert of Allow user to manually fetch remote commands

[binjin, 2015-05-13 16:05:23]

The CQ bit was checked by binjin@chromium.org

[commit-bot: I haz the power, 2015-05-13 16:08:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1132223003/1

[commit-bot: I haz the power, 2015-05-13 17:05:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 17:06:16]

Patchset 1 (id:??) landed as
https://crrev.com/d7f2f2b28ae05528a593104806e0c9975a8025b1
Cr-Commit-Position: refs/heads/master@{#329660}