Simplify taskqueue interface.

Simplify taskqueue interface.

The removed complexity was a holdover from the initial versions of this library.

R=dnj@chromium.org, estaab@chromium.org, martiniss@chromium.org, vadimsh@chromium.org
BUG=

Committed: https://chromium.googlesource.com/infra/infra/+/83bb08d7ae9bd07fedc3b932b104fc8c9a26e50f

[iannucci, 2015-07-16 23:02:19]

On 2015/07/16 23:02:01, iannucci wrote:

PTAL, this one's short

[Vadim Sh., 2015-07-16 23:02:42]

lgtm

[iannucci, 2015-07-16 23:04:04]

The CQ bit was checked by iannucci@chromium.org

[iannucci, 2015-07-16 23:04:05]

The patchset sent to the CQ was uploaded after l-g-t-m from vadimsh@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/1235563007/#ps20001
(title: "fix test")

[commit-bot: I haz the power, 2015-07-16 23:04:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1235563007/20001

[commit-bot: I haz the power, 2015-07-16 23:07:07]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/infra/infra/+/83bb08d7ae9bd07fedc3b932b104f...