[Mac] Restore the Chrome main menu if there are no windows on the active space.

[Mac] Restore the Chrome main menu if there are no windows on the active space.

When an app window closes, we skip restoring the Chrome main menu if
there are other windows to minimize the number of times the main menu is
changed. This doesn't work if the other windows are on different spaces.
This ensures the Chrome menu is restored if there are no other windows
on the active space.

BUG=467323
Committed: https://crrev.com/0c169fe7fcece6e098fab9902d75d4fe91555843
Cr-Commit-Position: refs/heads/master@{#322495}

[jackhou1, 2015-03-23 01:56:39]

jackhou@chromium.org changed reviewers:
+ tapted@chromium.org

[jackhou1, 2015-03-23 01:56:40]

tapted, could you take a look?

[tapted, 2015-03-26 19:01:00]

lgtm! Sorry for the delay

[jackhou1, 2015-03-26 22:41:24]

The CQ bit was checked by jackhou@chromium.org

[commit-bot: I haz the power, 2015-03-26 22:41:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1024363002/1

[commit-bot: I haz the power, 2015-03-26 23:31:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-26 23:32:09]

Patchset 1 (id:??) landed as
https://crrev.com/0c169fe7fcece6e098fab9902d75d4fe91555843
Cr-Commit-Position: refs/heads/master@{#322495}