Fix for Fullscreen toolbar with multiple monitors on OSX

Fix for Fullscreen toolbar with multiple monitors on OSX

When checking for the active window during the menubar dropdown
progress, use the isMainWindow property instead of onActiveSpace.

If we have multiple monitors, onActiveSpace can return true, even if the
window isn't active.

BUG=606511
Review-Url: https://codereview.chromium.org/1979663002
Cr-Commit-Position: refs/heads/master@{#393642}
(cherry picked from commit bde4e511c9b163ae0f2926a12834485cf9f6e996)

Committed: https://chromium.googlesource.com/chromium/src/+/7ce0183043107443e995b20de48fdc6bf4381821

[spqchan, 2016-05-16 17:02:19]

Description was changed from

==========
Fix for Fullscreen toolbar with multiple monitors on OSX

When checking for the active window during the menubar dropdown
progress, use the isMainWindow property instead of onActiveSpace.

If we have multiple monitors, onActiveSpace can return true, even if the
window isn't active.

BUG=606511

Review-Url: https://codereview.chromium.org/1979663002
Cr-Commit-Position: refs/heads/master@{#393642}
(cherry picked from commit bde4e511c9b163ae0f2926a12834485cf9f6e996)
==========

to

==========
Fix for Fullscreen toolbar with multiple monitors on OSX

When checking for the active window during the menubar dropdown
progress, use the isMainWindow property instead of onActiveSpace.

If we have multiple monitors, onActiveSpace can return true, even if the
window isn't active.

BUG=606511

Review-Url: https://codereview.chromium.org/1979663002
Cr-Commit-Position: refs/heads/master@{#393642}
(cherry picked from commit bde4e511c9b163ae0f2926a12834485cf9f6e996)

Committed:
https://chromium.googlesource.com/chromium/src/+/7ce0183043107443e995b20de48f...
==========

[spqchan, 2016-05-16 17:02:21]

Committed patchset #1 (id:1) manually as
7ce0183043107443e995b20de48fdc6bf4381821.