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/cpptoc/task_runner_cpptoc.h

@@ -28,7 +28,6 @@ class CefTaskRunnerCppToC
     : public CefCppToC<CefTaskRunnerCppToC, CefTaskRunner, cef_task_runner_t> {
  public:
   explicit CefTaskRunnerCppToC(CefTaskRunner* cls);
-  virtual ~CefTaskRunnerCppToC() {}
 };
 
 #endif  // BUILDING_CEF_SHARED