Cannot reset font size for help when shown in side pane.

Task-number: QTCREATORBUG-2924
Reviewed-by: ck

src/plugins/help/helpplugin.h

@@ -115,6 +115,10 @@ private slots:
 
     void openFindToolBar();
 
+    void scaleRightPaneUp();
+    void scaleRightPaneDown();
+    void resetRightPaneScale();
+
 private:
     void setupUi();
     void resetFilter();