Improve inheritance support in the CEF API (issue #1623).

- Support single parent inheritance in CEF API classes.
- Support non-virtual inheritance in CEF API classes.
- Support translation of CEF API sub-directories.
- Add test sub-directories for testing-only functionality that will be
  available to unit tests but not exposed via the binary distribution.
- Add unit tests for the translator tool.
- Fix parsing of template parameter types that include commas.

libcef_dll/cpptoc/context_menu_handler_cpptoc.h

@@ -28,9 +28,8 @@ class CefContextMenuHandlerCppToC
     : public CefCppToC<CefContextMenuHandlerCppToC, CefContextMenuHandler,
         cef_context_menu_handler_t> {
  public:
-  explicit CefContextMenuHandlerCppToC(CefContextMenuHandler* cls);
+  CefContextMenuHandlerCppToC();
 };
 
 #endif  // USING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CPPTOC_CONTEXT_MENU_HANDLER_CPPTOC_H_
-