Reland Reenable unused-import lint check for telemetry.

Reland Reenable unused-import lint check for telemetry.
patch from issue 1051323006 at patchset 40001 (http://crrev.com/1051323006#ps40001)

BUG=475714
Committed: https://crrev.com/c78f00838a4db55c89521b1606e26f134be8b0be
Cr-Commit-Position: refs/heads/master@{#327340}

[nednguyen, 2015-04-22 18:35:42]

nednguyen@google.com changed reviewers:
+ dtu@chromium.org, mef@chromium.org, sullivan@chromium.org

[nednguyen, 2015-04-22 18:35:43]

+Mef: I would want to understand how the Linux Tests bot running
telemetry_unittest. The CQ did pass before, so it's a bit strange that
telemetry_unittest fails on Linux Tests bot

[dtu, 2015-04-23 00:07:30]

On 2015/04/22 18:35:43, nednguyen wrote:
> +Mef: I would want to understand how the Linux Tests bot running
> telemetry_unittest. The CQ did pass before, so it's a bit strange that
> telemetry_unittest fails on Linux Tests bot

lgtm for when this issue is resolved and you're ready to land.

[mef, 2015-04-23 14:59:42]

mef@chromium.org changed reviewers:
- mef@chromium.org

[mef, 2015-04-23 15:02:02]

On 2015/04/22 18:35:43, nednguyen wrote:
> +Mef: I would want to understand how the Linux Tests bot running
> telemetry_unittest. The CQ did pass before, so it's a bit strange that
> telemetry_unittest fails on Linux Tests bot

I've really got no idea how does Linux Tests bot run telemetry_unittest, I've
just tried to keep bots green. :)
I'd be happy to help, but I'm really not the right person.

[nednguyen, 2015-04-28 17:35:05]

The CQ bit was checked by nednguyen@google.com

[nednguyen, 2015-04-28 17:35:05]

The patchset sent to the CQ was uploaded after l-g-t-m from dtu@chromium.org
Link to the patchset: https://codereview.chromium.org/1103553002/#ps20001
(title: "Rebase ")

[commit-bot: I haz the power, 2015-04-28 17:35:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1103553002/20001

[commit-bot: I haz the power, 2015-04-28 18:52:27]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-28 18:53:26]

Patchset 2 (id:??) landed as
https://crrev.com/c78f00838a4db55c89521b1606e26f134be8b0be
Cr-Commit-Position: refs/heads/master@{#327340}