With always-on enabled, always shut down the hotword detector after a trigger.

With always-on enabled, always shut down the hotword detector after a trigger.

This is because the hotword stream requires that it be closed and
re-opened after triggering and currently, the only way to do this is to
shutdown the detector since its stream cannot be replaced.

BUG=403138
Committed: https://crrev.com/792cef165819a3dba7725ac42c349369b4cf60a4
Cr-Commit-Position: refs/heads/master@{#317023}

[Anand Mistry (off Chromium), 2015-02-19 04:31:35]

amistry@chromium.org changed reviewers:
+ kcarattini@chromium.org

[kcarattini, 2015-02-19 05:56:39]

lgtm

[Anand Mistry (off Chromium), 2015-02-19 06:43:11]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2015-02-19 06:44:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/940833002/1

[commit-bot: I haz the power, 2015-02-19 07:16:51]

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

[commit-bot: I haz the power, 2015-02-19 07:16:52]

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

[Anand Mistry (off Chromium), 2015-02-19 10:10:10]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2015-02-19 10:10:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/940833002/1

[commit-bot: I haz the power, 2015-02-19 10:42:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-19 10:43:24]

Patchset 1 (id:??) landed as
https://crrev.com/792cef165819a3dba7725ac42c349369b4cf60a4
Cr-Commit-Position: refs/heads/master@{#317023}