Debugger: Hide some dock widget access

Change-Id: I6cd12a0a7a04f4d37165828552c08263537cfdbb
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggermainwindow.h

@@ -80,8 +80,6 @@ public:
     void initialize();
 
     void onModeChanged(Core::IMode *mode);
-    QDockWidget *dockWidget(const QString &objectName) const;
-    bool isDockVisible(const QString &objectName) const;
 
     // Dockwidgets are registered to the main window.
     QDockWidget *createDockWidget(const DebuggerLanguage &language, QWidget *widget);