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/stream_reader_ctocpp.h

@@ -31,7 +31,6 @@ class CefStreamReaderCToCpp
   explicit CefStreamReaderCToCpp(cef_stream_reader_t* str)
       : CefCToCpp<CefStreamReaderCToCpp, CefStreamReader, cef_stream_reader_t>(
           str) {}
-  virtual ~CefStreamReaderCToCpp() {}
 
   // CefStreamReader methods
   virtual size_t Read(void* ptr, size_t size, size_t n) OVERRIDE;