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/ctocpp/completion_callback_ctocpp.h

@@ -28,14 +28,11 @@ class CefCompletionCallbackCToCpp
     : public CefCToCpp<CefCompletionCallbackCToCpp, CefCompletionCallback,
         cef_completion_callback_t> {
  public:
-  explicit CefCompletionCallbackCToCpp(cef_completion_callback_t* str)
-      : CefCToCpp<CefCompletionCallbackCToCpp, CefCompletionCallback,
-          cef_completion_callback_t>(str) {}
+  CefCompletionCallbackCToCpp();
 
-  // CefCompletionCallback methods
+  // CefCompletionCallback methods.
   void OnComplete() override;
 };
 
 #endif  // BUILDING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CTOCPP_COMPLETION_CALLBACK_CTOCPP_H_
-