Fixes for wxWebKitCtrl to work with wxNotebook.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27547 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/html/webkit.h

@@ -70,6 +70,7 @@ public:
     void OnSize(wxSizeEvent &event);
 protected:
     DECLARE_EVENT_TABLE()
+    void MacVisibilityChanged();
 
 private:
     wxWindow *m_parent;