It2Me Host cleanup - Remove task_runner_

It2Me Host cleanup - Remove task_runner_

This member seems to have been used when we ran code using a plugin_task_runner
that was passed in to us, however that is no longer the case and we can now
use the host_context_ for all of our task running needs.  I also removed some
invalid DCHECKs that were required in the past, but were incorrectly updated
in previous CLs and are no longer useful.

BUG=650792
Committed: https://crrev.com/61431fea97b63bf714d7b411e68b9321d09bbb38
Cr-Commit-Position: refs/heads/master@{#421905}

[joedow, 2016-09-29 18:17:17]

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

[commit-bot: I haz the power, 2016-09-29 18:17:54]

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, 2016-09-29 18:46:16]

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

[commit-bot: I haz the power, 2016-09-29 18:46:17]

Dry run: This issue passed the CQ dry run.

[joedow, 2016-09-29 18:46:26]

joedow@chromium.org changed reviewers:
+ sergeyu@chromium.org

[joedow, 2016-09-29 18:46:27]

PTAL!

I will send out a second CL with the changes for confirmation_dialog_ removal
once this lands.

Thanks!
Joe

[Sergey Ulanov, 2016-09-29 19:30:08]

lgtm

[joedow, 2016-09-29 19:30:53]

The CQ bit was checked by joedow@chromium.org

[commit-bot: I haz the power, 2016-09-29 19:31:36]

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, 2016-09-29 19:39:28]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-29 19:44:07]

Description was changed from

==========
It2Me Host cleanup - Remove task_runner_

This member seems to have been used when we ran code using a plugin_task_runner
that was passed in to us, however that is no longer the case and we can now
use the host_context_ for all of our task running needs.  I also removed some
invalid DCHECKs that were required in the past, but were incorrectly updated
in previous CLs and are no longer useful.

BUG=650792
==========

to

==========
It2Me Host cleanup - Remove task_runner_

This member seems to have been used when we ran code using a plugin_task_runner
that was passed in to us, however that is no longer the case and we can now
use the host_context_ for all of our task running needs.  I also removed some
invalid DCHECKs that were required in the past, but were incorrectly updated
in previous CLs and are no longer useful.

BUG=650792

Committed: https://crrev.com/61431fea97b63bf714d7b411e68b9321d09bbb38
Cr-Commit-Position: refs/heads/master@{#421905}
==========

[commit-bot: I haz the power, 2016-09-29 19:44:08]

Patchset 2 (id:??) landed as
https://crrev.com/61431fea97b63bf714d7b411e68b9321d09bbb38
Cr-Commit-Position: refs/heads/master@{#421905}