Revert of Prevent the Online Reauth window from opening twice.

Revert of Prevent the Online Reauth window from opening twice. (patchset #2 id:20001 of https://codereview.chromium.org/1415743002/ )

Reason for revert:
Reverting this as it caused Issue 545819 which would prevent people from unlocking profiles on canary

Original issue's description:
> Prevent the Online Reauth window from opening twice.
>
> BUG=534726
> TEST=
> 1. Add a supervised user to Chrome
> 2. From a regular profile, click on the avatar button and select
>    "Exit and Childlock"
> 3. In the User Manager, click on the yellow triangle next to the
>    locked profile's name
> 4. The Online Reauth window should open once, not open-close-reopen
>
> Committed: https://crrev.com/e020927c5d71942748f67c25c347d1355dd11135
> Cr-Commit-Position: refs/heads/master@{#355139}

TBR=groby@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=534726
Committed: https://crrev.com/f01bd4ddfbdc27494c89299288ddde452d632ce1
Cr-Commit-Position: refs/heads/master@{#355532}

[anthonyvd, 2015-10-22 14:05:07]

Created Revert of Prevent the Online Reauth window from opening twice.

[commit-bot: I haz the power, 2015-10-22 14:05:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1413663008/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1413663008/1

[commit-bot: I haz the power, 2015-10-22 14:06:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-22 14:06:53]

Patchset 1 (id:??) landed as
https://crrev.com/f01bd4ddfbdc27494c89299288ddde452d632ce1
Cr-Commit-Position: refs/heads/master@{#355532}