Remove DCHECK in WmWindowMus::CloseWidget()

Remove DCHECK in WmWindowMus::CloseWidget()

And improve comment. Additionally removes some dead includes in
RootWindowController.

BUG=671246
TEST=none
R=jamescook@chromium.org

Review-Url: https://codereview.chromium.org/2610853012
Cr-Commit-Position: refs/heads/master@{#442029}
Committed: https://chromium.googlesource.com/chromium/src/+/21adf48e93469ae8be2fbbf7d47806a574127b0f

[sky, 2017-01-06 19:00:00]

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

[commit-bot: I haz the power, 2017-01-06 19:00:36]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[James Cook, 2017-01-06 19:25:37]

LGTM

[commit-bot: I haz the power, 2017-01-06 20:11:53]

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

[commit-bot: I haz the power, 2017-01-06 20:11:54]

Dry run: This issue passed the CQ dry run.

[sky, 2017-01-06 20:22:55]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2017-01-06 20:23:21]

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, 2017-01-06 20:30:08]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483734175939800, "parent_rev":
"9ea74b3f541f6850a48f6a2b4d08f3d4de95dcf4", "commit_rev":
"21adf48e93469ae8be2fbbf7d47806a574127b0f"}

[commit-bot: I haz the power, 2017-01-06 20:30:41]

Description was changed from

==========
Remove DCHECK in WmWindowMus::CloseWidget()

And improve comment. Additionally removes some dead includes in
RootWindowController.

BUG=671246
TEST=none
R=jamescook@chromium.org
==========

to

==========
Remove DCHECK in WmWindowMus::CloseWidget()

And improve comment. Additionally removes some dead includes in
RootWindowController.

BUG=671246
TEST=none
R=jamescook@chromium.org

Review-Url: https://codereview.chromium.org/2610853012
Cr-Commit-Position: refs/heads/master@{#442029}
Committed:
https://chromium.googlesource.com/chromium/src/+/21adf48e93469ae8be2fbbf7d478...
==========

[commit-bot: I haz the power, 2017-01-06 20:30:42]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/21adf48e93469ae8be2fbbf7d478...