Revert of Change ProcessThread's task type to be the one from TaskQueue.

Revert of Change ProcessThread's task type to be the one from TaskQueue. (patchset #3 id:80001 of https://codereview.webrtc.org/2016043003/ )

Reason for revert:
Downstream issues

Original issue's description:
> Change ProcessThread's task type to be the one from TaskQueue.
> ProcessThread will eventually be replaced by TaskQueue, so this is the first little step.
>
> BUG=
> R=magjed@webrtc.org
>
> Committed: https://crrev.com/400a276c8a0b299190ff17a81edd8780a26d63d3
> Cr-Commit-Position: refs/heads/master@{#12952}

TBR=magjed@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/641455176a1241dea6dda7071ba4162f41a0b5fc
Cr-Commit-Position: refs/heads/master@{#12953}

[tommi, 2016-05-28 17:02:27]

The CQ bit was checked by tommi@webrtc.org

[tommi, 2016-05-28 17:02:28]

Created Revert of Change ProcessThread's task type to be the one from TaskQueue.

[commit-bot: I haz the power, 2016-05-28 17:02:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2020783003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2020783003/1

[commit-bot: I haz the power, 2016-05-28 18:00:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-28 18:00:45]

Description was changed from

==========
Revert of Change ProcessThread's task type to be the one from TaskQueue.
(patchset #3 id:80001 of https://codereview.webrtc.org/2016043003/ )

Reason for revert:
Downstream issues 

Original issue's description:
> Change ProcessThread's task type to be the one from TaskQueue.
> ProcessThread will eventually be replaced by TaskQueue, so this is the first
little step.
> 
> BUG=
> R=magjed@webrtc.org
> 
> Committed: https://crrev.com/400a276c8a0b299190ff17a81edd8780a26d63d3
> Cr-Commit-Position: refs/heads/master@{#12952}

TBR=magjed@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=
==========

to

==========
Revert of Change ProcessThread's task type to be the one from TaskQueue.
(patchset #3 id:80001 of https://codereview.webrtc.org/2016043003/ )

Reason for revert:
Downstream issues

Original issue's description:
> Change ProcessThread's task type to be the one from TaskQueue.
> ProcessThread will eventually be replaced by TaskQueue, so this is the first
little step.
>
> BUG=
> R=magjed@webrtc.org
>
> Committed: https://crrev.com/400a276c8a0b299190ff17a81edd8780a26d63d3
> Cr-Commit-Position: refs/heads/master@{#12952}

TBR=magjed@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: https://crrev.com/641455176a1241dea6dda7071ba4162f41a0b5fc
Cr-Commit-Position: refs/heads/master@{#12953}
==========

[commit-bot: I haz the power, 2016-05-28 18:00:47]

Patchset 1 (id:??) landed as
https://crrev.com/641455176a1241dea6dda7071ba4162f41a0b5fc
Cr-Commit-Position: refs/heads/master@{#12953}

[tommi, 2016-05-28 21:57:03]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2017333002/ by tommi@webrtc.org.

The reason for reverting is: Reland. It was a false alarm..