Revert of CrOS: Use GitilesPoller on tryserver. (patchset #2 id:20001 of https://codereview.chromium.org/1211573004/)
Revert of CrOS: Use GitilesPoller on tryserver. (patchset #2 id:20001 of https://codereview.chromium.org/1211573004/)

Reason for revert:
GitilesPoller is not working on master, reverting to get production working again.

Original issue's description:
> CrOS: Use GitilesPoller on tryserver.
> 
> BUG=None
> TEST=local
>   - Ran master, seems to be polling without error.
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=295823

TBR=iannucci@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/1212513005

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@295845 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build