webgui: small syntax changes in osr_handler

gui/cefdisplay/inc/osr_handler.h

@@ -24,8 +24,8 @@
 
 class OsrHandler : public BaseHandler, public CefRenderHandler {
 public:
-   explicit OsrHandler(THttpServer *serv = 0);
-   ~OsrHandler();
+   explicit OsrHandler(THttpServer *serv = nullptr);
+   virtual ~OsrHandler() {}
 
    // CefClient methods:
    virtual CefRefPtr<CefRenderHandler> GetRenderHandler() OVERRIDE { return this; }

gui/cefdisplay/src/osr_handler.cxx

@@ -26,10 +26,6 @@ OsrHandler::OsrHandler(THttpServer *serv) : BaseHandler(serv)
 {
 }
 
-OsrHandler::~OsrHandler()
-{
-}
-
 bool OsrHandler::GetRootScreenRect(CefRefPtr<CefBrowser> browser, CefRect &rect)
 {
    CEF_REQUIRE_UI_THREAD();