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

src/qt/bitcoingui.cpp

@@ -237,7 +237,7 @@ BitcoinGUI::~BitcoinGUI()
         trayIcon->hide();
 #ifdef Q_OS_MAC
     delete appMenuBar;
-    MacDockIconHandler::instance()->setMainWindow(NULL);
+    MacDockIconHandler::cleanup();
 #endif
 
     delete rpcConsole;

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;

src/qt/macdockiconhandler.mm

@@ -68,7 +68,6 @@ void MacDockIconHandler::setMainWindow(QMainWindow *window) {
 
 MacDockIconHandler::~MacDockIconHandler()
 {
-    [this->m_dockIconClickEventHandler release];
     delete this->m_dummyWidget;
     this->setMainWindow(NULL);
 }
@@ -118,6 +117,11 @@ MacDockIconHandler *MacDockIconHandler::instance()
     return s_instance;
 }
 
+void MacDockIconHandler::cleanup()
+{
+    delete s_instance;
+}
+
 void MacDockIconHandler::handleDockIconClickEvent()
 {
     if (this->mainWindow)