Remove usage of FOR_EACH_OBSERVER macro in components/signin

Remove usage of FOR_EACH_OBSERVER macro in components/signin

Observer lists now support range-based for loops.

BUG=655021
Committed: https://crrev.com/0f50484f7c534e731522341bdede48b3712973b8
Cr-Commit-Position: refs/heads/master@{#425737}

[Eric Willigers, 2016-10-16 23:10:50]

The CQ bit was checked by ericwilligers@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-16 23:10:56]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-17 00:39:36]

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

[commit-bot: I haz the power, 2016-10-17 00:39:37]

Dry run: This issue passed the CQ dry run.

[Eric Willigers, 2016-10-17 00:56:46]

ericwilligers@chromium.org changed reviewers:
+ rogerta@chromium.org

[Roger Tawa OOO till Jul 10th, 2016-10-17 17:02:42]

lgtm

[Eric Willigers, 2016-10-17 18:44:21]

The CQ bit was checked by ericwilligers@chromium.org

[commit-bot: I haz the power, 2016-10-17 18:45:11]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-17 18:57:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-17 18:59:27]

Description was changed from

==========
Remove usage of FOR_EACH_OBSERVER macro in components/signin

Observer lists now support range-based for loops.


BUG=655021
==========

to

==========
Remove usage of FOR_EACH_OBSERVER macro in components/signin

Observer lists now support range-based for loops.

BUG=655021

Committed: https://crrev.com/0f50484f7c534e731522341bdede48b3712973b8
Cr-Commit-Position: refs/heads/master@{#425737}
==========

[commit-bot: I haz the power, 2016-10-17 18:59:29]

Patchset 1 (id:??) landed as
https://crrev.com/0f50484f7c534e731522341bdede48b3712973b8
Cr-Commit-Position: refs/heads/master@{#425737}