Update to Chromium revision 40af916d (#303546).

- Standardize usage of virtual/override specifiers in CEF internals (see http://crbug.com/417463).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1903 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef_dll/ctocpp/callback_ctocpp.h

@@ -29,7 +29,6 @@ class CefCallbackCToCpp
  public:
   explicit CefCallbackCToCpp(cef_callback_t* str)
       : CefCToCpp<CefCallbackCToCpp, CefCallback, cef_callback_t>(str) {}
-  virtual ~CefCallbackCToCpp() {}
 
   // CefCallback methods
   virtual void Continue() OVERRIDE;