mac: Fix a logic error in presentation_mode_controller.

mac: Fix a logic error in presentation_mode_controller.

The method -shouldShowMenubarInImmersiveFullscreen failed to take into
consideration whether the screen containing the window had a menu bar.

BUG=NONE
TEST=On OSX 10.9 or OSX 10.10, set the screensHaveSeparateSpaces setting to NO.
On a second monitor, fullscreen a youtube video. Move the mouse to the top of
screen. The tabstrip should appear, and should not have extra space for a menu
bar. Prior to this CL, there would be extra space for a non-existent menu bar.

Committed: https://crrev.com/c1207e6e5804b054f31fc6d7b219caf9943c8e09
Cr-Commit-Position: refs/heads/master@{#299011}

[erikchen, 2014-10-09 22:05:18]

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

[erikchen, 2014-10-09 22:05:18]

rsesek: Please review.

[Robert Sesek, 2014-10-09 22:52:25]

LGTM

[erikchen, 2014-10-09 22:58:27]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2014-10-09 23:00:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/645643004/1

[commit-bot: I haz the power, 2014-10-09 23:55:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-09 23:55:52]

Patchset 1 (id:??) landed as
https://crrev.com/c1207e6e5804b054f31fc6d7b219caf9943c8e09
Cr-Commit-Position: refs/heads/master@{#299011}