[QT] some mac specifiy cleanup (memory handling, unnecessary code)

src/qt/macdockiconhandler.h

@@ -14,12 +14,6 @@ class QMenu;
 class QWidget;
 QT_END_NAMESPACE
 
-#ifdef __OBJC__
-@class DockIconClickEventHandler;
-#else
-class DockIconClickEventHandler;
-#endif
-
 /** Macintosh-specific dock icon handler.
  */
 class MacDockIconHandler : public QObject
@@ -33,7 +27,7 @@ public:
     void setIcon(const QIcon &icon);
     void setMainWindow(QMainWindow *window);
     static MacDockIconHandler *instance();
-
+    static void cleanup();
     void handleDockIconClickEvent();
 
 signals:
@@ -42,7 +36,6 @@ signals:
 private:
     MacDockIconHandler();
 
-    DockIconClickEventHandler *m_dockIconClickEventHandler;
     QWidget *m_dummyWidget;
     QMenu *m_dockMenu;
     QMainWindow *mainWindow;