Utils::TreeViewComboBox: Add missing Q_OBJECT

Change-Id: Ie9a19af03172edebe67b6531864bffde799ab84c
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/libs/utils/treeviewcombobox.h

@@ -39,6 +39,7 @@ namespace Utils {
 
 class QTCREATOR_UTILS_EXPORT TreeViewComboBoxView : public QTreeView
 {
+    Q_OBJECT
 public:
     TreeViewComboBoxView(QWidget *parent = 0);
     void adjustWidth(int width);
@@ -46,6 +47,7 @@ public:
 
 class QTCREATOR_UTILS_EXPORT TreeViewComboBox : public QComboBox
 {
+    Q_OBJECT
 public:
     TreeViewComboBox(QWidget *parent = 0);