Fix compilation error on OSX 10.12.

Fix compilation error on OSX 10.12.

chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_mouse_tracker.mm
does not include the header for a class that it uses,
BrowserWindowController. This CL adds the missing include and fixes the
OSX 10.12 build error documented in the associated bug.

BUG=660292
Committed: https://crrev.com/7fcceb13d277f6f7fd3bed8843de3bb8495faecd
Cr-Commit-Position: refs/heads/master@{#428351}

[pwnall, 2016-10-28 06:22:56]

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

[commit-bot: I haz the power, 2016-10-28 06:23:13]

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

[pwnall, 2016-10-28 06:24:26]

pwnall@chromium.org changed reviewers:
+ rsesek@chromium.org

[pwnall, 2016-10-28 06:24:26]

PTAL?

[commit-bot: I haz the power, 2016-10-28 07:11:06]

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

[commit-bot: I haz the power, 2016-10-28 07:11:09]

Dry run: This issue passed the CQ dry run.

[Robert Sesek, 2016-10-28 13:13:47]

The CQ bit was checked by rsesek@chromium.org

[Robert Sesek, 2016-10-28 13:13:47]

lgtm

[commit-bot: I haz the power, 2016-10-28 13:13:55]

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, 2016-10-28 13:19:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-28 13:23:30]

Description was changed from

==========
Fix compilation error on OSX 10.12.

chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_mouse_tracker.mm
does not include the header for a class that it uses,
BrowserWindowController. This CL adds the missing include and fixes the
OSX 10.12 build error documented in the associated bug.

BUG=660292
==========

to

==========
Fix compilation error on OSX 10.12.

chrome/browser/ui/cocoa/fullscreen/fullscreen_toolbar_mouse_tracker.mm
does not include the header for a class that it uses,
BrowserWindowController. This CL adds the missing include and fixes the
OSX 10.12 build error documented in the associated bug.

BUG=660292

Committed: https://crrev.com/7fcceb13d277f6f7fd3bed8843de3bb8495faecd
Cr-Commit-Position: refs/heads/master@{#428351}
==========

[commit-bot: I haz the power, 2016-10-28 13:23:31]

Patchset 1 (id:??) landed as
https://crrev.com/7fcceb13d277f6f7fd3bed8843de3bb8495faecd
Cr-Commit-Position: refs/heads/master@{#428351}