use wxOVERRIDE

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76220 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/html/helpview/helpview.cpp

@@ -46,8 +46,8 @@ public:
     // initialization (doing it here and not in the ctor allows to have an error
     // return: if OnInit() returns false, the application terminates)
 
-    virtual bool OnInit();
-    virtual int OnExit();
+    virtual bool OnInit() wxOVERRIDE;
+    virtual int OnExit() wxOVERRIDE;
 
 private:
     wxHtmlHelpController *help;