Remove unused NetPrefObserver forward declaration.

Remove unused NetPrefObserver forward declaration.

This CL removes the last reference of NetPrefObserver from the codebase.  This
is a follow-up to https://crrev.com/2172543003.

Committed: https://crrev.com/d9105221453f8b446b082a61ca809cb8bebfd9ef
Cr-Commit-Position: refs/heads/master@{#408208}

[Bence, 2016-07-26 19:52:03]

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

[commit-bot: I haz the power, 2016-07-26 19:52:26]

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, 2016-07-26 20:46:40]

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

[commit-bot: I haz the power, 2016-07-26 20:46:41]

Dry run: This issue passed the CQ dry run.

[Bence, 2016-07-27 14:25:41]

bnc@chromium.org changed reviewers:
+ skuhne@chromium.org

[Bence, 2016-07-27 14:25:41]

Mr4D: PTAL.  Thank you.

[Mr4D (OOO till 08-26), 2016-07-27 18:35:01]

lgtm

[Bence, 2016-07-27 19:04:00]

The CQ bit was checked by bnc@chromium.org

[commit-bot: I haz the power, 2016-07-27 19:04:33]

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, 2016-07-27 19:08:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-27 19:09:26]

Description was changed from

==========
Remove unused NetPrefObserver forward declaration.

This CL removes the last reference of NetPrefObserver from the codebase.  This
is a follow-up to https://crrev.com/2172543003.
==========

to

==========
Remove unused NetPrefObserver forward declaration.

This CL removes the last reference of NetPrefObserver from the codebase.  This
is a follow-up to https://crrev.com/2172543003.

Committed: https://crrev.com/d9105221453f8b446b082a61ca809cb8bebfd9ef
Cr-Commit-Position: refs/heads/master@{#408208}
==========

[commit-bot: I haz the power, 2016-07-27 19:09:27]

Patchset 1 (id:??) landed as
https://crrev.com/d9105221453f8b446b082a61ca809cb8bebfd9ef
Cr-Commit-Position: refs/heads/master@{#408208}