[gtk+] (3 commits) Non-fast-forward update to branch wip/dboles/combobox-cleanup

[Daniel Boles <dboles src gnome org>]

The branch 'wip/dboles/combobox-cleanup' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  6ae07a0... combobox: Remove property cell-area
  614334b... combobox: Move area and menu to .ui file
  a37954a... combobox: Stop pointlessly NULL-checking the menu

Commits added to the branch:

  439fcf7... combobox: Remove property cell-area
  8c98044... combobox: Move area and menu to .ui file
  90b9dc4... combobox: Stop pointlessly NULL-checking the menu