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/drag_data_cpptoc.h

@@ -27,9 +27,8 @@
 class CefDragDataCppToC
     : public CefCppToC<CefDragDataCppToC, CefDragData, cef_drag_data_t> {
  public:
-  explicit CefDragDataCppToC(CefDragData* cls);
+  CefDragDataCppToC();
 };
 
 #endif  // BUILDING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CPPTOC_DRAG_DATA_CPPTOC_H_
-