Remove unused blocking pool methods from web::WebThread.

Remove unused blocking pool methods from web::WebThread.

These methods are unused and deprecated in favor of TaskScheduler.

BUG=667892
Review-Url: https://codereview.chromium.org/2906753004
Cr-Commit-Position: refs/heads/master@{#475126}
Committed: https://chromium.googlesource.com/chromium/src/+/c342fa0f3ef65dbb37db1df35c02ded2d989902e

[fdoray, 2017-05-26 18:19:18]

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

[commit-bot: I haz the power, 2017-05-26 18:19:41]

Dry run: 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, 2017-05-26 18:28:44]

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

[commit-bot: I haz the power, 2017-05-26 18:28:45]

Dry run: Try jobs failed on following builders:
  ios-device-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-xcode-...)
  ios-simulator on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)
  ios-simulator-xcode-clang on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator-xco...)

[fdoray, 2017-05-26 18:32:02]

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

[commit-bot: I haz the power, 2017-05-26 18:32:51]

Dry run: 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, 2017-05-26 19:01:17]

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

[commit-bot: I haz the power, 2017-05-26 19:01:21]

Dry run: This issue passed the CQ dry run.

[fdoray, 2017-05-26 20:25:20]

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

[fdoray, 2017-05-26 20:25:21]

PTAL

[Eugene But (OOO till 7-30), 2017-05-26 20:40:35]

lgtm

[gab, 2017-05-26 21:03:55]

The CQ bit was checked by gab@chromium.org

[commit-bot: I haz the power, 2017-05-26 21:04:38]

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, 2017-05-26 21:11:01]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1495832635858740,
"parent_rev": "ee244e0d9db7e2d348cef7f5b979b51336e18008", "commit_rev":
"c342fa0f3ef65dbb37db1df35c02ded2d989902e"}

[commit-bot: I haz the power, 2017-05-26 21:11:11]

Description was changed from

==========
Remove unused blocking pool methods from web::WebThread.

These methods are unused and deprecated in favor of TaskScheduler.

BUG=667892
==========

to

==========
Remove unused blocking pool methods from web::WebThread.

These methods are unused and deprecated in favor of TaskScheduler.

BUG=667892

Review-Url: https://codereview.chromium.org/2906753004
Cr-Commit-Position: refs/heads/master@{#475126}
Committed:
https://chromium.googlesource.com/chromium/src/+/c342fa0f3ef65dbb37db1df35c02...
==========

[commit-bot: I haz the power, 2017-05-26 21:11:12]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/c342fa0f3ef65dbb37db1df35c02...

[sdefresne, 2017-05-30 10:24:10]

A revert of this CL (patchset #3 id:40001) has been created in
https://codereview.chromium.org/2915583002/ by sdefresne@chromium.org.

The reason for reverting is: This is blocking revert of
https://codereview.chromium.org/2881873002..