Revert of Expand scope of enable_hotwording.

Revert of Expand scope of enable_hotwording. (patchset #5 id:80001 of https://codereview.chromium.org/2209843002/ )

Reason for revert:
Broke official CrOS build.

Original issue's description:
> Expand scope of enable_hotwording.
>
> It is currently only in chrome/browser/BUILD.gn even though it is used
> elsewhere. Moving it to chrome/common/features.gni and checking for it
> where it is used.
>
> BUG=634044
>
> Committed: https://crrev.com/560dba3c9e8878608d735a811cfaaf29aa6fab88
> Cr-Commit-Position: refs/heads/master@{#409651}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=634044
Committed: https://crrev.com/60c1473ba214cff9ee701d5ea55b0c6025b582a7
Cr-Commit-Position: refs/heads/master@{#409681}

[Lei Zhang, 2016-08-04 00:18:31]

The CQ bit was checked by thestig@chromium.org

[Lei Zhang, 2016-08-04 00:18:32]

Created Revert of Expand scope of enable_hotwording.

[commit-bot: I haz the power, 2016-08-04 00:19:26]

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, 2016-08-04 00:20:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-04 00:22:38]

Description was changed from

==========
Revert of Expand scope of enable_hotwording. (patchset #5 id:80001 of
https://codereview.chromium.org/2209843002/ )

Reason for revert:
Broke official CrOS build.

Original issue's description:
> Expand scope of enable_hotwording.
> 
> It is currently only in chrome/browser/BUILD.gn even though it is used
> elsewhere. Moving it to chrome/common/features.gni and checking for it
> where it is used.
> 
> BUG=634044
> 
> Committed: https://crrev.com/560dba3c9e8878608d735a811cfaaf29aa6fab88
> Cr-Commit-Position: refs/heads/master@{#409651}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=634044
==========

to

==========
Revert of Expand scope of enable_hotwording. (patchset #5 id:80001 of
https://codereview.chromium.org/2209843002/ )

Reason for revert:
Broke official CrOS build.

Original issue's description:
> Expand scope of enable_hotwording.
>
> It is currently only in chrome/browser/BUILD.gn even though it is used
> elsewhere. Moving it to chrome/common/features.gni and checking for it
> where it is used.
>
> BUG=634044
>
> Committed: https://crrev.com/560dba3c9e8878608d735a811cfaaf29aa6fab88
> Cr-Commit-Position: refs/heads/master@{#409651}

TBR=dpranke@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=634044

Committed: https://crrev.com/60c1473ba214cff9ee701d5ea55b0c6025b582a7
Cr-Commit-Position: refs/heads/master@{#409681}
==========

[commit-bot: I haz the power, 2016-08-04 00:22:39]

Patchset 1 (id:??) landed as
https://crrev.com/60c1473ba214cff9ee701d5ea55b0c6025b582a7
Cr-Commit-Position: refs/heads/master@{#409681}

[Dirk Pranke, 2016-08-04 00:24:49]

lgtm