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/request_context_handler_ctocpp.h

@@ -28,14 +28,11 @@ class CefRequestContextHandlerCToCpp
     : public CefCToCpp<CefRequestContextHandlerCToCpp, CefRequestContextHandler,
         cef_request_context_handler_t> {
  public:
-  explicit CefRequestContextHandlerCToCpp(cef_request_context_handler_t* str)
-      : CefCToCpp<CefRequestContextHandlerCToCpp, CefRequestContextHandler,
-          cef_request_context_handler_t>(str) {}
+  CefRequestContextHandlerCToCpp();
 
-  // CefRequestContextHandler methods
+  // CefRequestContextHandler methods.
   CefRefPtr<CefCookieManager> GetCookieManager() override;
 };
 
 #endif  // BUILDING_CEF_SHARED
 #endif  // CEF_LIBCEF_DLL_CTOCPP_REQUEST_CONTEXT_HANDLER_CTOCPP_H_
-