Remove usage of FOR_EACH_OBSERVER macro in ui/app_list

Remove usage of FOR_EACH_OBSERVER macro in ui/app_list

Observer lists now support range-based for loops.

BUG=655021
Committed: https://crrev.com/741d9665244b69173a34ddc8a6c1ecf5c9dc188f
Cr-Commit-Position: refs/heads/master@{#425746}

[Eric Willigers, 2016-10-15 13:58:01]

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

[commit-bot: I haz the power, 2016-10-15 13:58:07]

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

[Eric Willigers, 2016-10-15 14:04:43]

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

[commit-bot: I haz the power, 2016-10-15 14:13:34]

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

[commit-bot: I haz the power, 2016-10-15 14:13:35]

Dry run: Try jobs failed on following builders:
  linux_chromium_chromeos_ozone_rel_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[xiyuan, 2016-10-17 15:48:41]

lgtm

[Eric Willigers, 2016-10-17 18:44:57]

The CQ bit was checked by ericwilligers@chromium.org

[commit-bot: I haz the power, 2016-10-17 18:45:49]

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 19:24:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-17 19:27:57]

Description was changed from

==========
Remove usage of FOR_EACH_OBSERVER macro in ui/app_list

Observer lists now support range-based for loops.


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

to

==========
Remove usage of FOR_EACH_OBSERVER macro in ui/app_list

Observer lists now support range-based for loops.

BUG=655021

Committed: https://crrev.com/741d9665244b69173a34ddc8a6c1ecf5c9dc188f
Cr-Commit-Position: refs/heads/master@{#425746}
==========

[commit-bot: I haz the power, 2016-10-17 19:27:58]

Patchset 1 (id:??) landed as
https://crrev.com/741d9665244b69173a34ddc8a6c1ecf5c9dc188f
Cr-Commit-Position: refs/heads/master@{#425746}