Hide window from taskbar when "minimize to tray" active by making window into Tool window

src/qt/bitcoingui.h

@@ -58,8 +58,6 @@ private:
 
     QStackedWidget *centralWidget;
 
-    QWidget *dummyWidget;
-
     OverviewPage *overviewPage;
     QWidget *transactionsPage;
     AddressBookPage *addressBookPage;
@@ -133,8 +131,6 @@ public slots:
     void gotoMessagePage();
     void gotoMessagePage(QString);
 
-    void showNormal();
-
 private slots:
     /** Switch to overview (home) page */
     void gotoOverviewPage();