Fix bug in quicklaunch

Fix bug in quicklaunch

RemoveWindow can be called when the messageloop is already
shutdown. If this happens we don't want to quit the messageloop as we
hit a DCHECK.

BUG=594600
TEST=none
R=ben@chromium.org

Committed: https://crrev.com/a12f3aa9f4e8eefd3c8003106f54c4a2d2fef616
Cr-Commit-Position: refs/heads/master@{#402486}

[Ben Goodger (Google), 2016-06-28 14:01:51]

lgtm

[sky, 2016-06-28 16:23:07]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2016-06-28 16:24:14]

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, 2016-06-28 16:30:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-28 16:32:06]

Description was changed from

==========
Fix bug in quicklaunch

RemoveWindow can be called when the messageloop is already
shutdown. If this happens we don't want to quit the messageloop as we
hit a DCHECK.

BUG=594600
TEST=none
R=ben@chromium.org
==========

to

==========
Fix bug in quicklaunch

RemoveWindow can be called when the messageloop is already
shutdown. If this happens we don't want to quit the messageloop as we
hit a DCHECK.

BUG=594600
TEST=none
R=ben@chromium.org

Committed: https://crrev.com/a12f3aa9f4e8eefd3c8003106f54c4a2d2fef616
Cr-Commit-Position: refs/heads/master@{#402486}
==========

[commit-bot: I haz the power, 2016-06-28 16:32:06]

Patchset 1 (id:??) landed as
https://crrev.com/a12f3aa9f4e8eefd3c8003106f54c4a2d2fef616
Cr-Commit-Position: refs/heads/master@{#402486}