Treat regular and always-on hotwording settings as mutually exclusive.

Treat regular and always-on hotwording settings as mutually exclusive.

Only one should be set, so update functions to reflect this. In the rare
case both are set, always-on takes precedence.

BUG=397019
Committed: https://crrev.com/c82af9411c9c8f0b3d43f709642ac892e1a2c36d
Cr-Commit-Position: refs/heads/master@{#302382}

[Anand Mistry (off Chromium), 2014-10-29 02:04:34]

amistry@chromium.org changed reviewers:
+ benwells@chromium.org, estade@chromium.org

[Anand Mistry (off Chromium), 2014-10-29 02:04:34]

benwells@chromium.org: Please review changes in start_page_service

estade@chromium.org: Please review changes in c/b/r/hotword/*

[benwells, 2014-10-29 06:13:48]

lgtm

[Evan Stade, 2014-10-29 22:36:44]

rslgtm

[Evan Stade, 2014-10-29 22:36:45]

rslgtm

[Anand Mistry (off Chromium), 2014-10-29 23:33:09]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2014-10-29 23:35:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/685053002/1

[commit-bot: I haz the power, 2014-10-29 23:43:21]

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

[commit-bot: I haz the power, 2014-10-29 23:43:22]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[Anand Mistry (off Chromium), 2014-10-30 00:12:07]

On 2014/10/29 22:36:45, Evan Stade wrote:
> rslgtm

presubmit doesn't recognise this as an lgtm.

[Matt Giuca, 2014-10-30 00:12:52]

Please edit the title of this CL: s/settigns/settings/

[Anand Mistry (off Chromium), 2014-10-30 00:43:02]

On 2014/10/30 00:12:52, Matt Giuca wrote:
> Please edit the title of this CL: s/settigns/settings/

Done.

[Evan Stade, 2014-10-31 18:30:13]

On 2014/10/30 00:43:02, Anand Mistry wrote:
> On 2014/10/30 00:12:52, Matt Giuca wrote:
> > Please edit the title of this CL: s/settigns/settings/
> 
> Done.

sorry, lgtm

[Anand Mistry (off Chromium), 2014-11-01 09:09:33]

The CQ bit was checked by amistry@chromium.org

[commit-bot: I haz the power, 2014-11-01 09:10:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/685053002/1

[commit-bot: I haz the power, 2014-11-01 09:48:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-01 09:49:15]

Patchset 1 (id:??) landed as
https://crrev.com/c82af9411c9c8f0b3d43f709642ac892e1a2c36d
Cr-Commit-Position: refs/heads/master@{#302382}