Revert of [chromecast] Pass media task runner to MediaPipelineBackendManager.

Revert of [chromecast] Pass media task runner to MediaPipelineBackendManager. (patchset #8 id:140001 of https://codereview.chromium.org/1845783002/ )

Reason for revert:
Broke chromecast.  Will reland it after that's fixed.

Original issue's description:
> [chromecast] Pass media task runner to MediaPipelineBackendManager.
>
> This required making MediaPipelineBackendManager non-singleton and
> passed around wherever required.
>
> BUG=597450
>
> Committed: https://crrev.com/7f6a0145ae3deb8920771b2a2347af5f5c91aedd
> Cr-Commit-Position: refs/heads/master@{#384643}

TBR=alokp@chromium.org,halliwell@chromium.org,kmackay@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=597450
Committed: https://crrev.com/256cb1b61f5f9658536b083ff2862152348cf0a3
Cr-Commit-Position: refs/heads/master@{#384756}

[tianyuwang1, 2016-04-02 00:29:31]

Created Revert of [chromecast] Pass media task runner to
MediaPipelineBackendManager.

[tianyuwang1, 2016-04-02 00:29:52]

tianyuwang@google.com changed reviewers:
- halliwell@chromium.org, kmackay@chromium.org

[commit-bot: I haz the power, 2016-04-02 00:30:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1855633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1855633002/1

[commit-bot: I haz the power, 2016-04-02 00:30:05]

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

[commit-bot: I haz the power, 2016-04-02 00:30:07]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tianyuwang1, 2016-04-02 00:31:59]

The CQ bit was checked by tianyuwang@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-04-02 00:32:20]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1855633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1855633002/1

[commit-bot: I haz the power, 2016-04-02 00:32:30]

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

[commit-bot: I haz the power, 2016-04-02 00:32:31]

Dry run: This issue passed the CQ dry run.

[lcwu1, 2016-04-02 00:33:28]

lcwu@chromium.org changed reviewers:
+ lcwu@chromium.org

[lcwu1, 2016-04-02 00:33:29]

rs lgtm

[lcwu1, 2016-04-02 00:33:42]

The CQ bit was checked by lcwu@chromium.org

[commit-bot: I haz the power, 2016-04-02 00:34:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1855633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1855633002/1

[commit-bot: I haz the power, 2016-04-02 00:35:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-02 00:36:24]

Description was changed from

==========
Revert of [chromecast] Pass media task runner to MediaPipelineBackendManager.
(patchset #8 id:140001 of https://codereview.chromium.org/1845783002/ )

Reason for revert:
Broke chromecast.  Will reland it after that's fixed.

Original issue's description:
> [chromecast] Pass media task runner to MediaPipelineBackendManager.
> 
> This required making MediaPipelineBackendManager non-singleton and
> passed around wherever required.
> 
> BUG=597450
> 
> Committed: https://crrev.com/7f6a0145ae3deb8920771b2a2347af5f5c91aedd
> Cr-Commit-Position: refs/heads/master@{#384643}

TBR=alokp@chromium.org,halliwell@chromium.org,kmackay@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=597450
==========

to

==========
Revert of [chromecast] Pass media task runner to MediaPipelineBackendManager.
(patchset #8 id:140001 of https://codereview.chromium.org/1845783002/ )

Reason for revert:
Broke chromecast.  Will reland it after that's fixed.

Original issue's description:
> [chromecast] Pass media task runner to MediaPipelineBackendManager.
>
> This required making MediaPipelineBackendManager non-singleton and
> passed around wherever required.
>
> BUG=597450
>
> Committed: https://crrev.com/7f6a0145ae3deb8920771b2a2347af5f5c91aedd
> Cr-Commit-Position: refs/heads/master@{#384643}

TBR=alokp@chromium.org,halliwell@chromium.org,kmackay@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=597450

Committed: https://crrev.com/256cb1b61f5f9658536b083ff2862152348cf0a3
Cr-Commit-Position: refs/heads/master@{#384756}
==========

[commit-bot: I haz the power, 2016-04-02 00:36:25]

Patchset 1 (id:??) landed as
https://crrev.com/256cb1b61f5f9658536b083ff2862152348cf0a3
Cr-Commit-Position: refs/heads/master@{#384756}

[tianyuwang1, 2016-04-02 00:41:21]

tianyuwang@google.com changed reviewers:
+ halliwell@chromium.org

[alokp, 2016-04-02 04:17:40]

For future reference, you can always commit a revert by adding "TBR=<owner>" in
patch description.