Destroy PrerenderMessageFilter on the UI thread.

Destroy PrerenderMessageFilter on the UI thread.

PrerenderMessageFilter contains a subscription to a KeyedServiceShutdownNotifier,
which needs to be destroyed on the UI thread.

BUG=600368
Committed: https://crrev.com/a2b155292067c0b71c49c6d355c6b13374629890
Cr-Commit-Position: refs/heads/master@{#385458}

[Bernhard Bauer, 2016-04-04 17:16:21]

bauerb@chromium.org changed reviewers:
+ chrisha@chromium.org, thestig@chromium.org

[Bernhard Bauer, 2016-04-04 17:16:21]

Please review. Thanks!

[Lei Zhang, 2016-04-04 21:01:38]

thestig@chromium.org changed reviewers:
+ gavinp@chromium.org

[Lei Zhang, 2016-04-04 21:01:38]

Looks ok, but deferring to gavinp.

[gavinp, 2016-04-06 13:12:57]

lgtm.

[Bernhard Bauer, 2016-04-06 13:39:54]

The CQ bit was checked by bauerb@chromium.org

[commit-bot: I haz the power, 2016-04-06 13:40:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1858663002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1858663002/1

[commit-bot: I haz the power, 2016-04-06 14:30:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-06 14:31:26]

Description was changed from

==========
Destroy PrerenderMessageFilter on the UI thread.

PrerenderMessageFilter contains a subscription to a
KeyedServiceShutdownNotifier,
which needs to be destroyed on the UI thread.

BUG=600368
==========

to

==========
Destroy PrerenderMessageFilter on the UI thread.

PrerenderMessageFilter contains a subscription to a
KeyedServiceShutdownNotifier,
which needs to be destroyed on the UI thread.

BUG=600368

Committed: https://crrev.com/a2b155292067c0b71c49c6d355c6b13374629890
Cr-Commit-Position: refs/heads/master@{#385458}
==========

[commit-bot: I haz the power, 2016-04-06 14:31:28]

Patchset 1 (id:??) landed as
https://crrev.com/a2b155292067c0b71c49c6d355c6b13374629890
Cr-Commit-Position: refs/heads/master@{#385458}