Reduce usage of FOR_EACH_OBSERVER macro in base

Reduce usage of FOR_EACH_OBSERVER macro in base

Observer lists now support range-based for loops.

BUG=655021
Committed: https://crrev.com/a60549cd31bee65971319a1afd1cae62f8e7fa07
Cr-Commit-Position: refs/heads/master@{#425580}

[Eric Willigers, 2016-10-15 12:01:26]

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

[commit-bot: I haz the power, 2016-10-15 12:01:33]

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 13:10:18]

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

[commit-bot: I haz the power, 2016-10-15 16:02:32]

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

[commit-bot: I haz the power, 2016-10-15 16:02:32]

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_...)

[Lei Zhang, 2016-10-15 23:49:38]

The CQ bit was checked by thestig@chromium.org

[Lei Zhang, 2016-10-15 23:49:39]

lgtm

[commit-bot: I haz the power, 2016-10-15 23:49:41]

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, 2016-10-16 00:10:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-16 00:12:31]

Description was changed from

==========
Reduce usage of FOR_EACH_OBSERVER macro in base

Observer lists now support range-based for loops.


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

to

==========
Reduce usage of FOR_EACH_OBSERVER macro in base

Observer lists now support range-based for loops.

BUG=655021

Committed: https://crrev.com/a60549cd31bee65971319a1afd1cae62f8e7fa07
Cr-Commit-Position: refs/heads/master@{#425580}
==========

[commit-bot: I haz the power, 2016-10-16 00:12:32]

Patchset 1 (id:??) landed as
https://crrev.com/a60549cd31bee65971319a1afd1cae62f8e7fa07
Cr-Commit-Position: refs/heads/master@{#425580}