Change visibility of eventFilter().

Change-Id: I2d47e3d1f5a8fac5a1fe4638dce87a9e036f8544
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>

src/widgets/dialogs/qfontdialog.h

@@ -112,11 +112,9 @@ Q_SIGNALS:
 protected:
     void changeEvent(QEvent *event);
     void done(int result);
-
-private:
-    // ### Qt 5: make protected
     bool eventFilter(QObject *object, QEvent *event);
 
+private:
     Q_DISABLE_COPY(QFontDialog)
 
     Q_PRIVATE_SLOT(d_func(), void _q_sizeChanged(const QString &))