FancyMainWindow: Move toolbarDockWidget "property" to subclass

This was only used to accommodate the debugger main window
and is not needed in the base class.

Change-Id: Ifbe9937cd4c21f5bed2fab35b23d874f4f2dd0e4
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/debugger/debuggermainwindow.h

@@ -127,6 +127,7 @@ private:
     QComboBox *m_perspectiveChooser;
     QStackedWidget *m_controlsStackWidget;
     Utils::StatusLabel *m_statusLabel;
+    QDockWidget *m_toolbarDock;
 
     QHash<QByteArray, QDockWidget *> m_dockForDockId;
     QHash<QByteArray, QWidget *> m_toolbarForPerspectiveId;