Revert of Introduce SchedulerSingleThreadTaskRunnerManager

Revert of Introduce SchedulerSingleThreadTaskRunnerManager (patchset #7 id:280001 of https://codereview.chromium.org/2698843006/ )

Reason for revert:
TaskSchedulerSingleThreadTaskRunnerManagerTest.PrioritySetCorrectly is failing on numerous bots. See crbug.com/697697

Original issue's description:
> Introduce SchedulerSingleThreadTaskRunnerManager
> 
> This component provides one dedicated thread per
> SingleThreadTaskRunner.
> 
> Reference Change:
> https://codereview.chromium.org/2686593003/
> 
> BUG=684080, 694823
> 
> Review-Url: https://codereview.chromium.org/2698843006
> Cr-Commit-Position: refs/heads/master@{#453162}
> Committed: https://chromium.googlesource.com/chromium/src/+/fc203f52e046a8d82e053525d764671f7128f3d4

TBR=gab@chromium.org,fdoray@chromium.org,robliao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=684080, 694823, 697697
Review-Url: https://codereview.chromium.org/2722113006
Cr-Commit-Position: refs/heads/master@{#454346}
Committed: https://chromium.googlesource.com/chromium/src/+/78d29d2505c18c37f2869bcca08cf18701892655

[Theresa, 2017-03-02 18:44:03]

Created Revert of Introduce SchedulerSingleThreadTaskRunnerManager

[Theresa, 2017-03-02 18:44:20]

Description was changed from

==========
Revert of Introduce SchedulerSingleThreadTaskRunnerManager (patchset #7
id:280001 of https://codereview.chromium.org/2698843006/ )

Reason for revert:
TaskSchedulerSingleThreadTaskRunnerManagerTest.PrioritySetCorrectly is failing
on numerous bots. See crbug.com/697697

Original issue's description:
> Introduce SchedulerSingleThreadTaskRunnerManager
> 
> This component provides one dedicated thread per
> SingleThreadTaskRunner.
> 
> Reference Change:
> https://codereview.chromium.org/2686593003/
> 
> BUG=684080, 694823
> 
> Review-Url: https://codereview.chromium.org/2698843006
> Cr-Commit-Position: refs/heads/master@{#453162}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fc203f52e046a8d82e053525d764...

TBR=gab@chromium.org,fdoray@chromium.org,robliao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=684080, 694823
==========

to

==========
Revert of Introduce SchedulerSingleThreadTaskRunnerManager (patchset #7
id:280001 of https://codereview.chromium.org/2698843006/ )

Reason for revert:
TaskSchedulerSingleThreadTaskRunnerManagerTest.PrioritySetCorrectly is failing
on numerous bots. See crbug.com/697697

Original issue's description:
> Introduce SchedulerSingleThreadTaskRunnerManager
> 
> This component provides one dedicated thread per
> SingleThreadTaskRunner.
> 
> Reference Change:
> https://codereview.chromium.org/2686593003/
> 
> BUG=684080, 694823
> 
> Review-Url: https://codereview.chromium.org/2698843006
> Cr-Commit-Position: refs/heads/master@{#453162}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fc203f52e046a8d82e053525d764...

TBR=gab@chromium.org,fdoray@chromium.org,robliao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=684080, 694823, 697697
==========

[Theresa, 2017-03-02 18:44:30]

The CQ bit was checked by twellington@chromium.org

[commit-bot: I haz the power, 2017-03-02 18:45:01]

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, 2017-03-02 19:45:28]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488480270870170, "parent_rev":
"8dd0cb3cdf573d6ea0021f2962ef8116c9e80857", "commit_rev":
"78d29d2505c18c37f2869bcca08cf18701892655"}

[commit-bot: I haz the power, 2017-03-02 19:46:05]

Description was changed from

==========
Revert of Introduce SchedulerSingleThreadTaskRunnerManager (patchset #7
id:280001 of https://codereview.chromium.org/2698843006/ )

Reason for revert:
TaskSchedulerSingleThreadTaskRunnerManagerTest.PrioritySetCorrectly is failing
on numerous bots. See crbug.com/697697

Original issue's description:
> Introduce SchedulerSingleThreadTaskRunnerManager
> 
> This component provides one dedicated thread per
> SingleThreadTaskRunner.
> 
> Reference Change:
> https://codereview.chromium.org/2686593003/
> 
> BUG=684080, 694823
> 
> Review-Url: https://codereview.chromium.org/2698843006
> Cr-Commit-Position: refs/heads/master@{#453162}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fc203f52e046a8d82e053525d764...

TBR=gab@chromium.org,fdoray@chromium.org,robliao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=684080, 694823, 697697
==========

to

==========
Revert of Introduce SchedulerSingleThreadTaskRunnerManager (patchset #7
id:280001 of https://codereview.chromium.org/2698843006/ )

Reason for revert:
TaskSchedulerSingleThreadTaskRunnerManagerTest.PrioritySetCorrectly is failing
on numerous bots. See crbug.com/697697

Original issue's description:
> Introduce SchedulerSingleThreadTaskRunnerManager
> 
> This component provides one dedicated thread per
> SingleThreadTaskRunner.
> 
> Reference Change:
> https://codereview.chromium.org/2686593003/
> 
> BUG=684080, 694823
> 
> Review-Url: https://codereview.chromium.org/2698843006
> Cr-Commit-Position: refs/heads/master@{#453162}
> Committed:
https://chromium.googlesource.com/chromium/src/+/fc203f52e046a8d82e053525d764...

TBR=gab@chromium.org,fdoray@chromium.org,robliao@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=684080, 694823, 697697

Review-Url: https://codereview.chromium.org/2722113006
Cr-Commit-Position: refs/heads/master@{#454346}
Committed:
https://chromium.googlesource.com/chromium/src/+/78d29d2505c18c37f2869bcca08c...
==========

[commit-bot: I haz the power, 2017-03-02 19:46:06]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/78d29d2505c18c37f2869bcca08c...

[robliao, 2017-03-03 04:56:53]

lgtm