Revert of Use TaskScheduler instead of blocking pool in automatic_reboot_manager.cc.

Revert of Use TaskScheduler instead of blocking pool in automatic_reboot_manager.cc. (patchset #1 id:1 of https://codereview.chromium.org/2770783002/ )

Reason for revert:
Reverting b/c of chromeos test failures: https://uberchromegw.corp.google.com/i/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%281%29

Original issue's description:
> Use TaskScheduler instead of blocking pool in automatic_reboot_manager.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=stevenjb@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2770783002
> Cr-Commit-Position: refs/heads/master@{#466677}
> Committed: https://chromium.googlesource.com/chromium/src/+/b67baf11ed95e0e7eb570d99b6de407e48d89476

TBR=stevenjb@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892
Review-Url: https://codereview.chromium.org/2842563002
Cr-Commit-Position: refs/heads/master@{#466736}
Committed: https://chromium.googlesource.com/chromium/src/+/764bea2483c240b36b16a1a9196fa07c573ae42a

[hcarmona, 2017-04-24 20:22:15]

The CQ bit was checked by hcarmona@chromium.org

[hcarmona, 2017-04-24 20:22:15]

Created Revert of Use TaskScheduler instead of blocking pool in
automatic_reboot_manager.cc.

[commit-bot: I haz the power, 2017-04-24 20:23:02]

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, 2017-04-24 20:23:37]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493065335335920, "parent_rev":
"88bb958c59b218a5fe595ffe3ace9f11f21e28db", "commit_rev":
"764bea2483c240b36b16a1a9196fa07c573ae42a"}

[commit-bot: I haz the power, 2017-04-24 20:23:49]

Description was changed from

==========
Revert of Use TaskScheduler instead of blocking pool in
automatic_reboot_manager.cc. (patchset #1 id:1 of
https://codereview.chromium.org/2770783002/ )

Reason for revert:
Reverting b/c of chromeos test failures:
https://uberchromegw.corp.google.com/i/chromium.chromiumos/builders/Linux%20C...

Original issue's description:
> Use TaskScheduler instead of blocking pool in automatic_reboot_manager.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=stevenjb@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2770783002
> Cr-Commit-Position: refs/heads/master@{#466677}
> Committed:
https://chromium.googlesource.com/chromium/src/+/b67baf11ed95e0e7eb570d99b6de...

TBR=stevenjb@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892
==========

to

==========
Revert of Use TaskScheduler instead of blocking pool in
automatic_reboot_manager.cc. (patchset #1 id:1 of
https://codereview.chromium.org/2770783002/ )

Reason for revert:
Reverting b/c of chromeos test failures:
https://uberchromegw.corp.google.com/i/chromium.chromiumos/builders/Linux%20C...

Original issue's description:
> Use TaskScheduler instead of blocking pool in automatic_reboot_manager.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=stevenjb@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2770783002
> Cr-Commit-Position: refs/heads/master@{#466677}
> Committed:
https://chromium.googlesource.com/chromium/src/+/b67baf11ed95e0e7eb570d99b6de...

TBR=stevenjb@chromium.org,fdoray@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=667892

Review-Url: https://codereview.chromium.org/2842563002
Cr-Commit-Position: refs/heads/master@{#466736}
Committed:
https://chromium.googlesource.com/chromium/src/+/764bea2483c240b36b16a1a9196f...
==========

[commit-bot: I haz the power, 2017-04-24 20:23:50]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/764bea2483c240b36b16a1a9196f...