Fix initialization of udev in MidiManagerAlsa.

Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
crrev.com/17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
Committed: https://crrev.com/e74c2a9687c28f2718d71ae6ad9b6153119361c7
Cr-Commit-Position: refs/heads/master@{#404092}

[Adam Goode, 2016-07-07 02:07:19]

agoode@chromium.org changed reviewers:
+ toyoshim@chromium.org

[Adam Goode, 2016-07-07 02:08:04]

Description was changed from

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken since March, with
17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

to

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

[Adam Goode, 2016-07-07 02:09:13]

Description was changed from

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

to

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
crrev.com/17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

[Takashi Toyoshima, 2016-07-07 05:38:33]

Oops!
Thank you for catching this. LGTM.

[Takashi Toyoshima, 2016-07-07 05:47:17]

The CQ bit was checked by toyoshim@chromium.org

[commit-bot: I haz the power, 2016-07-07 05:47:29]

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, 2016-07-07 06:46:50]

Description was changed from

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
crrev.com/17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

to

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
crrev.com/17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

[commit-bot: I haz the power, 2016-07-07 06:46:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-07 06:46:55]

CQ bit was unchecked.

[commit-bot: I haz the power, 2016-07-07 06:49:06]

Description was changed from

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
crrev.com/17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123
==========

to

==========
Fix initialization of udev in MidiManagerAlsa.

New devices would not be detected on Linux. Worse,
things would get very confused if you disconnected
one device and connected another.

This has been broken for four months, with
crrev.com/17cd1b10ded3a5e730bbcb39c57a6d2f8e16a51e

BUG=625123

Committed: https://crrev.com/e74c2a9687c28f2718d71ae6ad9b6153119361c7
Cr-Commit-Position: refs/heads/master@{#404092}
==========

[commit-bot: I haz the power, 2016-07-07 06:49:07]

Patchset 1 (id:??) landed as
https://crrev.com/e74c2a9687c28f2718d71ae6ad9b6153119361c7
Cr-Commit-Position: refs/heads/master@{#404092}