Implement new approach for debugging leaked wrapper object references (issue #2593)

libcef_dll/cpptoc/keyboard_handler_cpptoc.h

@@ -9,7 +9,7 @@
 // implementations. See the translator.README.txt file in the tools directory
 // for more information.
 //
-// $hash=15f3db777d4fc5a1438f4e4d4b3a65433d778898$
+// $hash=58d79612910145862a792650dd380246fa1ebb02$
 //
 
 #ifndef CEF_LIBCEF_DLL_CPPTOC_KEYBOARD_HANDLER_CPPTOC_H_
@@ -32,6 +32,7 @@ class CefKeyboardHandlerCppToC
                                  cef_keyboard_handler_t> {
  public:
   CefKeyboardHandlerCppToC();
+  virtual ~CefKeyboardHandlerCppToC();
 };
 
 #endif  // CEF_LIBCEF_DLL_CPPTOC_KEYBOARD_HANDLER_CPPTOC_H_