Worker: Make WorkerThread inherit WebThread::TaskObserver instead of WorkerMicrotaskRunner

Worker: Make WorkerThread inherit WebThread::TaskObserver instead of WorkerMicrotaskRunner

For cleanup, this CL makes WorkerThread inherit WebThread::TaskObserver and
removes WorkerMicrotaskRunner that is used for observing WebThread activities
and forwarding them to WorkerThread.

BUG=n/a

Committed: https://crrev.com/cdb1f357fea7ae0d3041cd825975d6d06047019f
Cr-Commit-Position: refs/heads/master@{#427024}

[nhiroki, 2016-10-21 05:38:25]

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

[nhiroki, 2016-10-21 05:38:43]

nhiroki@chromium.org changed reviewers:
+ falken@chromium.org, yhirano@chromium.org

[nhiroki, 2016-10-21 05:38:43]

PTAL, thanks!

[commit-bot: I haz the power, 2016-10-21 05:38:46]

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, 2016-10-21 09:10:52]

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

[commit-bot: I haz the power, 2016-10-21 09:10:53]

Dry run: This issue passed the CQ dry run.

[yhirano, 2016-10-24 03:42:46]

lgtm

[nhiroki, 2016-10-24 03:46:24]

The CQ bit was checked by nhiroki@chromium.org

[commit-bot: I haz the power, 2016-10-24 03:46:33]

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, 2016-10-24 07:05:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-24 07:08:42]

Description was changed from

==========
Worker: Make WorkerThread inherit WebThread::TaskObserver instead of
WorkerMicrotaskRunner

For cleanup, this CL makes WorkerThread inherit WebThread::TaskObserver and
removes WorkerMicrotaskRunner that is used for observing WebThread activities
and forwarding them to WorkerThread.

BUG=n/a
==========

to

==========
Worker: Make WorkerThread inherit WebThread::TaskObserver instead of
WorkerMicrotaskRunner

For cleanup, this CL makes WorkerThread inherit WebThread::TaskObserver and
removes WorkerMicrotaskRunner that is used for observing WebThread activities
and forwarding them to WorkerThread.

BUG=n/a

Committed: https://crrev.com/cdb1f357fea7ae0d3041cd825975d6d06047019f
Cr-Commit-Position: refs/heads/master@{#427024}
==========

[commit-bot: I haz the power, 2016-10-24 07:08:43]

Patchset 1 (id:??) landed as
https://crrev.com/cdb1f357fea7ae0d3041cd825975d6d06047019f
Cr-Commit-Position: refs/heads/master@{#427024}