Remove unused LoginPerformer::Delegate setter and member.

Remove unused LoginPerformer::Delegate setter and member.

BUG=NONE

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285385

[pneubeck (no reviews), 2014-07-24 12:44:30]

grep doesn't show any usage.

[Denis Kuznetsov (DE-MUC), 2014-07-24 15:53:18]

lgtm

[pneubeck (no reviews), 2014-07-24 17:17:05]

The CQ bit was checked by pneubeck@chromium.org

[commit-bot: I haz the power, 2014-07-24 17:18:44]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/pneubeck@chromium.org/413133004/1

[commit-bot: I haz the power, 2014-07-24 18:19:09]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_rel_swarming on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel_sw...)

[commit-bot: I haz the power, 2014-07-24 18:51:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-24 18:51:28]

Try jobs failed on following builders:
  linux_chromium_rel_swarming on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_rel_sw...)

[pneubeck (no reviews), 2014-07-24 21:54:37]

The CQ bit was checked by pneubeck@chromium.org

[commit-bot: I haz the power, 2014-07-24 21:56:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/pneubeck@chromium.org/413133004/1

[commit-bot: I haz the power, 2014-07-24 22:04:33]

Change committed as 285385