Reduce usage of FOR_EACH_OBSERVER macro in content/

Reduce usage of FOR_EACH_OBSERVER macro in content/

Observer lists now support range-based for loops.

BUG=655021
Committed: https://crrev.com/6a42e2c8fdb718662a45a8c8d93327fdf9ea6c53
Cr-Commit-Position: refs/heads/master@{#425603}

[Eric Willigers, 2016-10-16 21:58:34]

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

[commit-bot: I haz the power, 2016-10-16 21:58:38]

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, 2016-10-16 23:42:13]

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

[commit-bot: I haz the power, 2016-10-16 23:42:14]

Dry run: This issue passed the CQ dry run.

[Eric Willigers, 2016-10-17 00:54:06]

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

[Avi (use Gerrit), 2016-10-17 00:59:19]

avi@chromium.org changed reviewers:
+ avi@chromium.org

[Avi (use Gerrit), 2016-10-17 00:59:19]

lgtm

drive by

[Eric Willigers, 2016-10-17 01:30:53]

The CQ bit was checked by ericwilligers@chromium.org

[commit-bot: I haz the power, 2016-10-17 01:31:01]

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 01:36:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-17 01:38:01]

Description was changed from

==========
Reduce usage of FOR_EACH_OBSERVER macro in content/

Observer lists now support range-based for loops.


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

to

==========
Reduce usage of FOR_EACH_OBSERVER macro in content/

Observer lists now support range-based for loops.

BUG=655021

Committed: https://crrev.com/6a42e2c8fdb718662a45a8c8d93327fdf9ea6c53
Cr-Commit-Position: refs/heads/master@{#425603}
==========

[commit-bot: I haz the power, 2016-10-17 01:38:02]

Patchset 1 (id:??) landed as
https://crrev.com/6a42e2c8fdb718662a45a8c8d93327fdf9ea6c53
Cr-Commit-Position: refs/heads/master@{#425603}