gn: Remove Scheduler::pool().

gn: Remove Scheduler::pool().

InputFileManager used this accessor to post a BLOCK_SHUTDOWN task.
This can be replaced by a call to ScheduleWork(). In both cases,
Scheduler::Run() doesn't return before the task runs.

BUG=

Committed: https://crrev.com/5476ec6bf7ccbada1734a0cdec7d570bb042aa30
Cr-Commit-Position: refs/heads/master@{#436362}

[fdoray, 2016-11-23 14:05:22]

The CQ bit was checked by fdoray@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-23 14:05:32]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[fdoray, 2016-11-23 14:05:34]

fdoray@chromium.org changed reviewers:
+ brettw@chromium.org

[fdoray, 2016-11-23 14:05:35]

PTAL

[commit-bot: I haz the power, 2016-11-23 14:16:08]

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

[commit-bot: I haz the power, 2016-11-23 14:16:08]

Dry run: This issue passed the CQ dry run.

[brettw, 2016-12-05 18:18:57]

lgtm

[fdoray, 2016-12-05 18:22:42]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2016-12-05 18:23:05]

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, 2016-12-05 18:36:59]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480962162530530, "parent_rev":
"d64bf9324f85ed0bcc1ba091e97587896007f4c1", "commit_rev":
"e00b74cfae4603520822fa72ce7f7697039029a7"}

[commit-bot: I haz the power, 2016-12-05 18:37:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-05 18:40:03]

Description was changed from

==========
gn: Remove Scheduler::pool().

InputFileManager used this accessor to post a BLOCK_SHUTDOWN task.
This can be replaced by a call to ScheduleWork(). In both cases,
Scheduler::Run() doesn't return before the task runs.

BUG=
==========

to

==========
gn: Remove Scheduler::pool().

InputFileManager used this accessor to post a BLOCK_SHUTDOWN task.
This can be replaced by a call to ScheduleWork(). In both cases,
Scheduler::Run() doesn't return before the task runs.

BUG=

Committed: https://crrev.com/5476ec6bf7ccbada1734a0cdec7d570bb042aa30
Cr-Commit-Position: refs/heads/master@{#436362}
==========

[commit-bot: I haz the power, 2016-12-05 18:40:04]

Patchset 1 (id:??) landed as
https://crrev.com/5476ec6bf7ccbada1734a0cdec7d570bb042aa30
Cr-Commit-Position: refs/heads/master@{#436362}