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

Revert of Use TaskScheduler instead of blocking pool in wizard_controller.cc. (patchset #3 id:40001 of https://codereview.chromium.org/2671263002/ )

Reason for revert:
Compile failure on official builds.

Link: https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20ChromeOS/builds/29028/

error like wizard_controller.cc:727:7:error: invalid argument type 'void' to unary expression

Original issue's description:
> Use TaskScheduler instead of blocking pool in wizard_controller.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=alemate@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2671263002
> Cr-Commit-Position: refs/heads/master@{#448504}
> Committed: https://chromium.googlesource.com/chromium/src/+/51464e865861790a1c332b8fc0d7ad7824dd3170

TBR=alemate@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/2678243002
Cr-Commit-Position: refs/heads/master@{#448516}
Committed: https://chromium.googlesource.com/chromium/src/+/7eea8952954c9b0db9ac932efc2389ba793c6e55

[tapted, 2017-02-07 02:24:38]

The CQ bit was checked by tapted@chromium.org

[tapted, 2017-02-07 02:24:38]

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

[commit-bot: I haz the power, 2017-02-07 02:25:04]

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, 2017-02-07 02:25:46]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486434278459480, "parent_rev":
"39d843f8a5df7d463c3a14b4fe493e19db91c87e", "commit_rev":
"7eea8952954c9b0db9ac932efc2389ba793c6e55"}

[commit-bot: I haz the power, 2017-02-07 02:26:40]

Description was changed from

==========
Revert of Use TaskScheduler instead of blocking pool in wizard_controller.cc.
(patchset #3 id:40001 of https://codereview.chromium.org/2671263002/ )

Reason for revert:
Compile failure on official builds.

Link:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Chrom...

error like wizard_controller.cc:727:7:error: invalid argument type 'void' to
unary expression

Original issue's description:
> Use TaskScheduler instead of blocking pool in wizard_controller.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=alemate@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2671263002
> Cr-Commit-Position: refs/heads/master@{#448504}
> Committed:
https://chromium.googlesource.com/chromium/src/+/51464e865861790a1c332b8fc0d7...

TBR=alemate@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 wizard_controller.cc.
(patchset #3 id:40001 of https://codereview.chromium.org/2671263002/ )

Reason for revert:
Compile failure on official builds.

Link:
https://build.chromium.org/p/chromium.chrome/builders/Google%20Chrome%20Chrom...

error like wizard_controller.cc:727:7:error: invalid argument type 'void' to
unary expression

Original issue's description:
> Use TaskScheduler instead of blocking pool in wizard_controller.cc.
> 
> The blocking pool is being deprecated in favor of TaskScheduler.
> 
> BUG=667892
> R=alemate@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2671263002
> Cr-Commit-Position: refs/heads/master@{#448504}
> Committed:
https://chromium.googlesource.com/chromium/src/+/51464e865861790a1c332b8fc0d7...

TBR=alemate@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/2678243002
Cr-Commit-Position: refs/heads/master@{#448516}
Committed:
https://chromium.googlesource.com/chromium/src/+/7eea8952954c9b0db9ac932efc23...
==========

[commit-bot: I haz the power, 2017-02-07 02:26:41]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/7eea8952954c9b0db9ac932efc23...